There’s are a few technical service orders (TSO) and several advisory circulars (AC) that establish the different levels of operational requirements for enroute, terminal, and approach RNAV gear.
Whether the specific gear is approved at a specific level depends upon what is called for in its certification and indicated in the operating manual for the equipment. The level might also vary when coupled with other equipment requirements on a specific aircraft and could be subject to the aircraft certificate itself as it has to be installed (and not handheld).
Required Navigational Performance (RNP) equipment falls under the RNAV umbrella, but takes it a step further and has to be able to monitor and alert the crew if performance fails or degrades. This includes the G suite with which we’re familiar.
Then, for the RNP AR (authorization required), there are more standards regarding aircraft and aircrew, as well as activation, maintenance, and monitoring of the procedure database that really only come with certain gear and operators. This is the FMS systems on various airliners and bizjets.
Generally, in the sim, much like their real-world counterparts, the GTN650/750, GNS430/530W, and G1000 systems are all RNP, WAAS capable, good to LPV approach standards. I think in some circumstances you can do RNP AR approaches using the G1000 in the sim, but that’s not standard kit in real life.
This is one area in the sim that plays a little fast and loose because we’re not really bound by the manuals and limitations, as it were. Slap it in and go, haha. But as @CasualClick said, the only way to know for sure is to load up the airplane and try it.