Difference between Tekton and Tekton Pro?

Hi,

I'm aware that Adobe's "Pro" designation means that the font contains all the necessary glyphs to set European languages. But that's not what I'm asking.

We have a client for whom we're preparing a book. We've been using Tekton Pro (Bold and Regular). We sent a PDF proof to the client and they say that they meant the old Tekton (not Pro--rather, the postscript version). I've tried to compare the two, but it's very difficult online.

My question is: is there a difference in the actual form of the letters between the old Tekton and Tekton Pro?

(In the case of Garamond and Garamond Premier Pro there is a significant difference between the shapes of some letters, for example.)

Thanks,
Ariel