If you can modify the mods, take the one that works on 2.3.0, since slrr steam 2.3.1 is more closer to 2.30, having similarities like:
Engine catalogs
Lacking of track selector
and the RPK internal structure
However, there's a catch: SLRR steam version ultilises custom gearbox scripting, and pedal mechanism on car that worked together. Simply put, you cannot run the car if your trans is auto, but the pedal is for manual ones. Both of them doesn't exist in 2.3.0. It need to be worked out.
With that being said, car and engine mods needs to be reworked a bit.
But, wheel and tyre mods will likely to work just fine, due to no alterations at all.
