I wouldn't even begin to know what other brand you could put that on.
I would just save it for parts.
For starters, it has a 3" flush valve, which eliminates all of the 2" flush valve bows.
The bolt pattern would have to match, and then there is the raised portion of the bowl that acts like a dam that may or not match up to the tank.
The real thing is, I don't know anyone that has put any infor out on it.
It would be a trial and error procedure.
You should be able to find a local supplier by going to the Toto web site
I would guess that there is someone within 10 miles of you that sells them.