I think it depends on the nature of what makes us trans.

I have body dysphoria for all the masculine attributes I was cursed with, I prefer the curves and soft traits common to women and preferred by societal norms. If men naturally had the body I want, now, but with the same behavior, societal status, etc, maybe I would be cis, just a little queer, a little effeminate in demeanor.

But since gender is more than just the body, I think, and with all other things the same besides sex traits, I'd almost definitely still be trans. So maybe I would still want to be a woman despite their harder, more angular bodies in this scenario. Those features would be what we consider feminine, and the whole package, rather than one part, is probably the likelier thing to want, psychologically, as a trans person.

Maybe I'd still prefer soft, smooth aesthetics despite the swap, so I'd have a masculine body (soft, smooth), but still identify as female, and with my current effeminate demeanor, instead of being cis. Or maybe I'd want to go through phalloplasty and take my estrogen to become big and bear-ish and enjoy my womanly beard finally growing in, because those things would be viewed as feminine, and I really just want the entire femme package.

Hell if I know! Fun thought experiment.