RE: TT Pro 46 - work with 60 size trainers?
Exactly.
The .60LA is in the "upper" range for most .60 high wing trainers, as is the .46LA for most .40-.46 trainers.
Manufacturing specs have nothing to do with this, rather that the .60LA is about the equivalent of a TT .46 ABN in terms of ACTUAL power ( actually the latter is a tad more powerful with the right tuning and prop.
So either could be used on the .60 trainer with very good results and as the plane itself is designed for.
I recently flew a .60 trainer someone brought out with a .40 FX engine in it. I was surprised at how well it performed, albeit with a lower pitch prop just as Jimmy suggests, for more thrust with less speed... making it a very good combination for the newbie.
A low wing more aerobatic plane would be a different kettle of fish altogether.