The other day I received an e-mail from one of the few people that actually read this raggedy-ass blog, asking me if I could compare some Minifigs and Pendraken. So I took some photos and posted them here, and I hope they help. These are for JChaos:
To sum up, I mix both (WWII and Modern), but I think the Modern mixes better than the WWII. I hope this helps you, Jorge!