Lord Yama's identity

I've been reading up on cosmology and am curious if Lord Suyama of Yama heaven and Lord Yama as judge of the recently deceased are the same figure. The latter is often said to reside in either the hell or preta realms, but since he is also a vaimanikapreta, I can't help but wonder if his time in the higher planes equates to this third level of heaven. Or are the same names simply coincidence? Any thoughts/sources are much appreciated.