I'm a higher altitude flier and you will see many of the planes flying with the largest recommended engine and bigger. You will even see 60's on 40 size planes around here. In my case 90's on 40 size planes and 40's on 25 sized planes.

I would think that a crashed and repaired trainer would fly with the highest recommended engine. If not you are starting to get a bit heavy and the plane will be a little harder to handle. If you do put on a bigger engine you will want to make sure the balance of the plane will also be correct. This might involve moving the flight equipment rearward, or adding ballast to the tail.