If you wanna do a straight up swap, then the 4AGZE from another AE92 would be your best bet. But the 4AGZE from an AE101 will also work and its got more HP but I'm not 100% sure as to which engine mounts will work better for this swap.
In both cases you're better off making sure your motor comes with the ECU and full harness, if you are missing the ECU you'll be having a nice time finding a replacement for it, same goes for the harness. At least if you're missing the harness you can always sit there and try to figure out each wire, but that's still a lot of work. If you're missing the ECU then there's no point in buying that motor really.
Your best bet, find a decent shop that will do the swap.
In both cases you're better off making sure your motor comes with the ECU and full harness, if you are missing the ECU you'll be having a nice time finding a replacement for it, same goes for the harness. At least if you're missing the harness you can always sit there and try to figure out each wire, but that's still a lot of work. If you're missing the ECU then there's no point in buying that motor really.
Your best bet, find a decent shop that will do the swap.