4621 is the same as 4620 but with backlit display. 4625 is almost the same as 4620 but with color display. i think these can be used with cm1, being set up as 4620. 4622 is a new ip callmaster, physically almost the same as 4620 but with a second headset jack instead of handset. i _think_ it can be used with cm1 but wouldn't bet on that.
yes, at least 4621 and 4625 should work.
communication manager is a new marketing name for the old'n'good definity software, starting with r11.1. in short, cm1 is r11, cm2 is r12 and cm3 is r13.
all of this is marketing crap. up to r10 definity was definity and definity software was definity software. starting with r10, it became multivantage (r10 and r11.0) and then it was renamed again and became communication manager (r11.1+). don't mind all this, release number is all you need.
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