Nowadays NGP (Next Generation Physics) 7 is the de facto standard for RBR Physics and RBRPro use it. All updates to NGP and to the cars developed for this
physics are also released by RBRPro.
Yes, this means that all modern mods of RBR share the same physics. A different feel between a mod and another does not depend on physics but on
different settings, since there are many parameters that can modify the force feedback, including the car setup.