Flowers

Summer Squash and Zuccini are the same after all, the stuff sold as Summer Squash has just yellow skinned fruits. Most autumn pumpkins got also blossoms just marginally differing, mostly in the size department.
The Soleil Summer Squash got nice blossoms that are fairly huge for a Zuccini but nicely tender and pointy. It is extra noted at some descriptions on the seed packages that they are rather neutral tasting and good looking eatables, great for decorating the salad platter just gently washed after collecting or to fry up dipped in liquid batter for use in a showy first course or desert, or clever vessel for condiment servings.
I never tried as my cooking style is not that hoity-toity, it is just as my husband and me realized that as we prefer juicy cubes in fast stir fries and pasta toppings over filled whole fruit from the oven in summer and spare the extra heat in the kitchen, buying an enlongated yellow squash that develops flavour earlier and seeds in pulp later seemed suddenly a bright idea, and we where not disapointed.

That is not what the garden center's guide says (all are cucurbita pepo as binominal according to Sperli brand that writes the latin name on the bag) and also the supermarket's "warenkunde" pages since you can get yellow squashes in grocery departments here (in Germany a very recent trend veggie still twice the price as green long zuccini) has a writeup saying they do not differ a lot.
https://www.edeka.de/rezepte-ernaehrung/expertenwissen/1000-fragen-1000-antworten/worin-unterscheiden-sich-gruene-und-gelbe-zucchini.jsp

Of course there are subtle differences, but those you can even have in two plants from the same bag. I once was silly enough to safe seeds from the One Balls instead of buying new seeds for spring at the store and I can tell you, what I did grow that year was mostly below average tasting to inpalatabe and each distinctly different in looks as the plants from the deco mini-pumkin sortiment. So far to saving seeds from an F1 hybrid.
There you see second-year One Balls: http://www.ipernity.com/doc/303247/27787957/in/album/552313
And for comparison a seed pack's presentation (my first year crop looked always like that as well)
https://www.samenhaus.de/zucchinisamen-zuccini-one-ball-f1-hybride-von-sperli-samen/a-575/

There is hardly any argument. It is just hard to sort anything in the world by name as long one uses the vernacular names. LOL

A zuccini is always a squash, but not all squashes are zuccinis, Usually a Zuccini is a C.pepo only Korean Zucchini is a C. moschata, while some in that species are allready called a pumpkin. Yellow oblong zuccinis where always called "summer squash" where we bought them in the USA in the grocery department, which was usually at Meijers or Farmer Jack's in MI. It seems that "summer squash" is alternately or also used for very young harvested and smal Pattison Squashes, although I have to say I hardly ever saw a Pattison at a store outside Halloween decoration selling time, and then that where sizeable flying saucer of the little green men, with rather hard waxy peel. I never tried such a odd looking thing.

And ideally, with a good one, you should be able to regrow next year from seeds of a matured one the same sort.... alas the Soleil is not much fun on this behalf. It produces fruits which are very tasty when young but as soon they exeed the size of a good EU-norm banana they develop a brown rotten point at the tip and a brown cord through the middle, spoiling and disolving the fruit before distinct seeds develop. Very clever to make people go back to the garden centre, no perenial sustainability. But at least no pretense as in the One Balls that get pretty even seeds but turn all strange variations the second time around.

Andy, courgette is as what the french sell zuccini, and they as apposed to germans have a long tradition of selling also round ball zuccini at the grocery, which looks like sort of a melon. One-Ball (bright yellow) and Eight-Ball (almost black dark green) are comercial seeds sold in Germany at the garden centres, with names derived from billard balls, suggesting sort of better harvest them small, at the size range of billard balls. :o)

When it comes to eating especially healthy, consider to grow stabile sorts of vegetables, resistant to mildew without any treatments ever, not pretty trend fruits for show.
I dont know actually why we started to grow a yellow ball summer squash first, likely for vanity as you cant buy any look-alikes at the discounter and tangerine-style segments as sweet and sour preserve are just so exotic looking and stick out. They have no real very special properties asides of form, colour and decoration value in the end, and there are just as fine and buttery tasting oblong fruit with a nicer yield and tougher leafs.