In my experience, they fit in nicely!
I got several lots in buys here on LAF, with a mix of manufacturers. For instance, I got the Foundry MG34 gunner that Amalric showed in his first comparison shot, but not the team member. So I did a slight correction in base hight for the gunner and a small conversion to an Artizan miniature to be the supporting team member. And as you can see, they match up perfectly:
For more pictures, check out my old fallschirmjäger
thread...