Swapping Nav Units in a 2004 Accord EX

I want to take the OEM Navigation unit (just the DVD unit in the trunk) in my girlfriend''s 2004 Accord and put into my Nav-equipped 2004 Accord. They both work, but hers is newer and I want to put the new one in my car before she trades her Accord in.
 
Is it just unplug, swap out and plug back? Is there anything else to it? Anything calibration to be done?

bill... you say she has a 2004 and so do you. Not sure how you''ve determined her''s is newer...

...unless you''re referring to the navigation dvd - in which case, you can simply eject it from her DVD ECU and swap it with the one in yours.