who's any good at IDing Gymnocalycium pics with flowers

[Stillman]

I have managed to germinate about 100 or so seedlings of this Gymnocalycium. Its a very common type I believe I picked it up at bunnings but I am having trouble IDing it. I initially thought it was a Gymnocalycium gibbosum

but could be Gymnocalycium denadatum also, or a hybrid of either I guess.

I managed to set a single fruit and as far as I am aware they are not self fertile. Unfortunately I have lost my records of what Gymno I used for pollen lol I think either a G. baldinium or G friedrichii

[Stillman]

Also

here is a pic of what I initially thought was G denudatum but I thick its more G damsii or anisitsii which I believe are the same plant just with possible locality variances?

I don't think I have had this one flower on me yet.

But here is a shot of my G anisitsii that I got from a different source it has much more red pigment which is a common trait in the species.