Mike,
I'm glad you agree. Railroads have been exchanging parts between power for YEARS. If you walk up to a locomotive on display in this country, and start looking closely at the side rods, one will rarely have a single side rod original to it. I have noticed on 487 that the crank pin on the engineers side, is from 495. I don't know if the C&T did this, or the Rio Grande. Maybe it's not just the crank pin, maybe it's the whole axle and drivers.
This process will never stop as long as those locomotives are running.
Kevin Bush