There is a downloadable sheet with terms from each software and short cut keys , I believe Autdoesk does still have it available.

All the terms in each software where developed apart from each other. Prior to being aquired by Autodesk.

EG: X is up in Max and Y is up in Maya.

Basic shaders are not the same either.

Mental Ray UI is also different as well, in both sofwares.

I worked on both teams for years and was the only QA that drove both.

The problem lies in the fact that you have many users on either side who would be very upset if one day you released a new version of Max and they had to now learn Maya terms and interface.

Not to mention no more Modifier Stack.!!

Sales would drop through the roof so that is why they are kept the way they are. Seperate.