AFAIK, there is no difference in how Building Blocks work in Word in any of the Ribbon versions. That is to say that the Building Blocks saved in a template in any of these versions will function in any of the other Ribbon versions.

There are differences in the Cover Page built-in building blocks. There may be other built-in building blocks differences that I haven't noticed. These should have no effect on building blocks stored in your custom templates.

Automated Boilerplate Using Microsoft Word
Where can Building Blocks be stored?