Board Thread:Warhammer 40k General Discussion/@comment-95.148.187.34-20130120214333/@comment-25784102-20151014145236

GW retconned the two universes. They are about as separate as you can get. It's kinda childish to sit here and try to argue lore with GW the people who created both series which is what some people are essentially doing when they stretch logic and lore to forcibly fit the two settings together even after the creators said they were separate.

If you really want to argue with GW you can use the "Salamanders are tanned but not black, White Scars not asian" argument. That always makes people smile.