I'm pretty sure everyone goes to the same place. The issue here would be what do aliens see when they arrive? It's basically analogous to the idea that if a Christian dies, they see Jesus, if a Muslim dies, they see the Prophet, etc, etc. I'm sure their afterlife experience is designed to at least at first conform to whatever notions/religions they have of what comes after. I recall reading in a thread here a while back that supposedly you can see/interact with dinosaurs in the afterlife, so I'd guess if the dinos are there, then aliens can be there, too.