I had earlier stated that the Ski shock lengths were the same on the PRO RMK as the IQ-RMK...
NOT THE CASE
From a VERY good source, I found out the following.
The PRO-RMK has a shock length of 17.50" and the IQ-RMK has a shock length of 17.20".
Although the A-Arm geometry is the same on the two sleds, the shock mount on the bulkhead of the PRO is mounted a touch higher and outboard more which necessitated the longer slightly length shock.
Also, with the PRO RMK, being a mostly metric snowmobile, the shock mounting bolts are slightly larger at 10mm.
So.... all that being said, if you want to move your "fancy shocks" from your IQ-RMK over to your pro.. the front end will sit slightly lower AND you will need to bore out the shock mounting bushings (in the shock eye) for the slightly larger 10mm bolts.... For optimal performance, they should probably be re-valved too as the IQ-RMK shocks are made for a 40 lb heavier sled.