Marty Sampson, the team leader on the RMK for Polaris, indicated to me that the shocks were interchangeable.
He worked personally with WE in Riverside on this shock package...
The need to change out shocks is slowly diminishing in importance.
If Rob is right about the pressed in fixed sleeve in place of the current spherical bearings....I think that FOX is trying to cut costs on the shocks.. the spherical bearings on the ends of the shocks are pretty pricey.. so I could see them going to a fixed bushing at least on one end if it does not change the performance of the shock.
Every chassis can benefit from valving that is dialed in... the beauty of the EVOL-X's is that both the nature of the compression damping, the degree of damping and the Rebound as well as spring crossover points/rates are adjustable... The X's will be direct translations from the RAW to the PRO... with some possible refinements....
Whatever you have on your RAW will bolt on... but for the kind of optimal performance that you expect from an aftermarket shock... custom valving makes the difference.
The FOX inserts for the bearings will need to be bored out a bit for the 10mm shock mounting bolts (old is .375"... new .394=10mm)
The new Walker Evans coilovers close the gap on on the stock to aftermarket shocks...
Of course a $1000 set of EVOL-R's, $1500 EVOL-X's, $850 for EXIT X-0's, $1050 for X-1s and $650 for Walker Needle Piggybacks will give you improved performance over what the factory can provide in a stock sled that is already very expensive.
As far as the A-arms go... they are essentially the same from what I can tell... but they are metric sizes on the bolt holes... I think that they will be interchangeable but the bushings, lower ball joints, and shock mount holes are going to need to be changed...
So Rob... it would be interesting to see you do some comparisons of the R's to your X's on the same PRO-RMK. (actual same sled...swapping only shocks)