The TT's are excellent machines. I like their looks too.
Believe it or don't believe it, but the engines are one and the same. Just a different power rating used to rate them and label them now after the class action lawsuit.
Go to Kohler's site. They only show a 26.5 (which is actually 25.5 when you look at the correct specs rating), no 29 efi. There's no 29 efi under the retired engines listing either. That's because the 29 became the 26.5 after the rating system change.
All you need to do is compare the model number designations on both engines, ie; ECV749.