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Victor, 

I don't like mixing different foundry releases of a particular font family, on "gut" feeling.  

Ehrhardt "MT" means that this is a Monotype font, and if the font logo is Adobe's, it means that Adobe has a license to package and sell it. My reading and experience shows that even with properly licensed fonts (such as the different foundries which may be licensed to package and sell "Monotype" or "ITC" fonts) is that there are often subtle differences in the way the fonts are presented to the end-user. This could include font metrics, minor differences in size, or kerning pairs. Or, then, maybe not. I don't think that there is a universal rule or license agreement about this. 

For example, I have Monotype Centaur -- a phenomenally beautiful and readable text and headline family -- from both Monotype and from Adobe. I believe that I had tested the two with the same text some years ago, and found occasional changes in line breaks due to differences in the kerning pairs. I soon purchased the extensive Monotype Centaur Expert set from Monotype. And I always pair that up with the Monotype standard fontset -- not Adobe's. Just in case. 

Another thing to look out for is different versions of the same fonts from the same foundry. For example, early cuts of Helvetica had (I believe) fewer kerning pairs than current versions. 

Neil