@Blutze @lauregami
Hmm you both actually bring up a point that I have been somewhat waiting to discuss. I well answer the easy thing first, unarmored female landsknechts if real would probably dress very differently from their male counterparts with long skirts and probably be like the ladies in these pic except gaudier if possible (remember landsknechts where allowed to dress however they wanted) and with the weapons and sword belts, maybe they would wear the hats:


Now with that out of the way, in general when it comes to plate armor, particularly full plate armor some outspoken historians and hobbyists (both in wargaming and the reenactor community) would argue heavily that there would be no difference in appearance since boob plate kills, men and woman have the same body proportions, etc. .
However there are some very real world issues with these arguments:
A: females in plate armor are not really a big thing in European history (ie, they likely where not even 1% to 3% of the armored individuals on the battlefield and more around a 0.9% to 0.1%) and would likely have worn armor borrowed from a male relative as opposed to armor made for them and possibly be hiding their gender (meaning real European historical examples are not really a good argument in this case, not even for headswaps, just use enclosed helms if you want to be historical).
B: medieval and Renaissance armor smiths where probably more like tailors and not likely to be the masters of scientific safety methods they are today and accounts of some historical battles made this really clear. Plate armor was just as likely to be a knights doom as his salvation half the time, and it wasn’t always just from drowning in puddles because you can’t get up in heavy armor, an awful lot of it was just shoddy in real life. Add to this that patent laws didn’t really exist till fairly late, meaning smiths probably didn’t willing share armor making knowledge except maybe with their apprentices, and you get some big questions on how real world female knights would have looked (and it really is a would have).
C: Men and women don’t actually have the same body proportions in real life on average. Modern ballistic armor made for males actually chaffs enough women that the USA’s military at least has developed female body armor.
D: A good number of female reenactor apparently wear these under their historical armor to protect themselves ( I think there is even diffrent sizes but I could be wrong on that):


E: Meanwhile in ancient India you have this, and no I am not sure if it is combat armor or ritual (I would assume the later but this did come up when I searched "ancient Indian women warriors in armor") :

Oh, and in both cases since we are talking women there wouldn’t be these:

So yeah… given all that armored female minis should look different for fantasy settings where female knights would be common (Maybe they wouldn't have double boobplate but I could see a uniboob plate and they would likely be smaller on average) and there isn't a real good reason to just do them as headswaps in a history set unless you really like the idea of girls wearing codpieces for some reason🤣.