The only visible difference is one has a silver from bezel while the other is all black.
I've read the specs line by line (I hope I didn't miss one) and there is no difference - in particular monitor resolution and frame rate supported.
I'm also assuming the PRO2 ("A") is a later model since the PRO3 uses the proprietary cables.
EDIT: I looked at the Copyright dates on the User Manuals for both models and they were both 2002. I did notice the PRO2 had a few more Hot Keys - it also had a inconsistency stating 2 different monitor resolutions (the lower one looked like the previous generation 1600 - I think they may have decided to edit the old manual and missed the 2nd reference to resolution.)
I've read the specs line by line (I hope I didn't miss one) and there is no difference - in particular monitor resolution and frame rate supported.
I'm also assuming the PRO2 ("A") is a later model since the PRO3 uses the proprietary cables.
EDIT: I looked at the Copyright dates on the User Manuals for both models and they were both 2002. I did notice the PRO2 had a few more Hot Keys - it also had a inconsistency stating 2 different monitor resolutions (the lower one looked like the previous generation 1600 - I think they may have decided to edit the old manual and missed the 2nd reference to resolution.)
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