VF,
No disrespect but you will not get the correct answer asking on Proon.
As TM is pretty much a closed shop and there are a vast number of variables at
play - your TM FSR is your man.
In direct 1 + 1 equals 2 terms the answer to your question is probably yes the higher creep engine would cost more.
Then again you do not know the limit at which the wheel is mandatorily replaced at overhaul - maybe both are.
TM will know for sure - and I doubt they subscribe or would ever place that data in "public".