3D Studio Max DCC plug-in for PhysX

Hi i have a question about the 3D Studio Max DCC plug-in for PhysX.
Why is the 3D Studio Max DCC plug-in for PhysX 3.3 newer than the 3.4 version? In a normal case the 3.4 version should be the newer than the 3.3

Which version should i use for 3D Studio Max 2013?
Should I use the v3.2 for 3ds Max 2011 also for e.g. 3ds max 2013 or 2015?

Or can I install:
v3.2 for 3ds max 2011
v3.4 / 3.3 for 3ds max 2013
and
v4.0 for 3ds max 2015
without any problems?

Greetings and thanks for the help :)