The cg isn't the same, I think it's been said there's more cg for the male mc because this was either supposed to be a BL but they decided to make it open, or there was some sort of comic before this with the male version? I forgot which one, but I do know there's more CG for the male player, and I think people are nicer to you if you're a female player due to ivar the misandrist stuff.
LONG STORY SHORTBC I RAMBLED: you should be good only playing as a male mc, you should actually get more cg that way
It's the latter, this was supposed to be a comic with Quill and Male MC as the protags thus already having a lot of the male CGs (comic art) beforehand. But yes, people are nicer to you if you choose a more femme appearance and there are some different art with Ivar, and Lyall.
Perhaps if I have the energy, I will redraw the femme version's Opening, but I do not have the willpower yet as I'm still heartbroken from losing the raw files of that scene