Toto SupremeII vs. other ultramax models

[Jupiter]

Hello,

I just purcahsed two supreme II's. In the guest bathroom, there was low height requirement which led me to that purchase. Figured I might as well get identical toilets. My main fear is this won't be as optimzed as say as the ultra max. It appears they have the exact same 'engine' just that one is shorter. Can anyone confirm that the toilets are the pretty much the same in what they do?

Thanks so much.