Do they all taste the same?

I've been "thinking" - and I blame you and your mixed up tomato seeds. If all courgettes, say, taste the same, I may as well mix them up and sow them as "unknown" courgettes. It really only matters if I want to save seeds (and I wouldn't save courgette seeds anyhow) or, if one plant does particularly well and I'd like to grow it again./or badly and don't!
I'm always tempted by packets of mixed varieties (like Morton's Mix Lettuce) so I think I'll make up my own Mixes.
Courgettes, Leeks, Lettuce, Chard and some Kale.

Adding Radishes to the list1

Always happy to help   . 

This might be controversial but I’m throwing cabbage into the ring for tasting the same. Granted, white, red, savory & spring greens do taste different. But all the varieties of each of them taste the same .

I think sweetheart cabbage tastes better than savoy.  There are some brussels that taste better than others, but I base my opinion on bought ones as I don't bother growing them. On the same subject,  some cauliflower tastes better than others. I think it is the level of sulphur compounds in a particular variety that makes the difference.

All broad beans taste the same. All celery taste the same. All parsnips taste the same and an onion is an onion.

Perhaps it would be easier to list the veg that do NOT taste the same! ..........Tomatoes and peppers. Anything else?