I got my X2 from SC Nomad take-off. Before I bought it, I compared the leverage curves which I didn't find different enough to warrant issue and presumed the tune would be similar.
The Specialized KSL X2 "RX" Tune was harder to decipher as it doesn't come with Code you can just identify on Fox's website but eventually I found out it's mostly just lighter slightly different shimmed slow Rebound stack.Out of interest, I used my starting numbers from Specialized configurator anyway and it rode well, but then tweaked them slightly by like 2-3 clicks, most notably in the Rebound.
The Rebound tune looks to be like it's rather repositioned range, so heavy rider would run out of range faster on RX than on stock after-market tune. In general looks to me like Specialized RX with Fox shocks and Forks is mostly lighter compression tune (similar to Fox "E-Bike" tune) so it feels more pleasant to novice riders.
For what's it worth, I am 90kg and the tune from Nomad seems to works perfectly on my KSL.
Definitely don't have it reshimmed until your 100 hours service, just don't waste money.