The proof that V-Ray is always V-Ray
Here the proof:
Did you know that V-Ray has a VRAY SCENE EXPORTER option?

All the V-Rays have this option:
V-Ray for 3ds Max, Rhino, Sketchup, Maya, C4D, Modo, Revit etc..
You can save files in “.vrscene” format and render them with V-Ray Standalone, which is an external application.
To be clear, we don’t need V-Ray Standalone but do you know what this means?
This means that V-Ray IS ALWAYS V-Ray, it doesn’t matter the platform you use: If you can export a V-Ray scene from any platform, to render into the same V-Ray Standalone, that means the parameters you have inside are EXACTLY THE SAME, it doesn’t matter what V-Ray you use.
For sure we have slight differences between the interfaces, some name a bit different, some tool is missing for the version, but finally this is the proof that you have the same product. Exactly the same product.
If you are too much focused on the interface – looking at it with blinkers for horses – so different “V-Rays” will be a problem for sure. But if you start using your mind, if you focus on the concepts, if you really got the 5SRW approach you can use the V-Ray platform you want.
You are much more than an “interface specialist”.