Olivaceus are typically a single color dorsally with a cream/white underside. Papuana are two tone on the top, lighter shades running bilaterally down a darker top color. I don't think that olivaceus alter their shades from day to day like papuana sometimes do either. Papuana have a more rounded nose and a rather distinct "cut" off of their lighter color chin where it turns into more of a yellow/white belly. There's also a fair bit of variation(Papuan pythons from the eastern half of New Guinea are bigger and have a longer head than the Papuans from the Western Papua end of New Guinea - Dave Barker) depending on what side of their range the papuana came from. Aussie olives are crazy when it comes to eating though. There are some pretty wild pictures of them taking enormous meals if you google around a bit - stuff like kangaroos and crocodiles! I can't comment on their behavior though since I've never kept one. I'm definitely looking forward to hearing about your experiences with yours.