I’m not sure if I can explain it. It looks rounder I guess with fuller cheeks. If you look at my avatar picture most of my prior cats had more of that shaped head.
Most of your cats have had a longer, more wedge shaped head? I think both head shapes are well within normal range for domestic cats.
If you want to call Indie a lookalike of some breed, you could say that she looks a little like a Bombay. That breed has a sleek glossy black coat, gold eyes, and a short face (normally quite a lot shorter than Indie's). It's almost certain that Indie isn't actually related to that breed, but her color makes her appear somewhat similar.