I have a set of 6600 cranks with dura ace rings...

On another bike I have the 7800 arms, but running a 42T (Cross bike)

I was thinking of swapping, but I was wondering if it was really worth the trouble....Would I notice any difference between cranks?

Does it really make much of a difference as far as a cat 5 guy goes? I weigh in at 151lbs...

My initial idea is no - it would not really matter...