The same hardware is (overwhelmingly likely) going to work on the 453, but the code is different. The original author of code (odyssey) now has an electric 453 and was working on a new system for that model.Are you still considering making it available for the 453?
Because of this question, I checked on the status of that project, and it seems like he's finished it and confirms on his documentation that it uses the same hardware (as I expected).
I've got a colleague with a 453 smart that's his wife's daily driver, so I've asked him and he's agreed to bring it in on Monday; I'll update one of our boxes to the 453 code and verify that it works. Once that's verified, we could just as easily offer the 453 version. (It's not possible to have one box work for both models at the same time, but you can freely re-program them from one to the other and back again if you happen to own both or be friends with someone with the "other" model electric drive.)