The easiest thing to do is unplug one phone and plug in the other and see if it works. Seriously, if you just replace an acd 3905 of one release with a 3905 of another release you should have no problems.
Prior to my Succession 3.0 upgrade, while at X11 R25.30, I had a problem with one Phase 3 M3905. I did a flash "downgrade" to my release level, and the problem cleared.
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