If you change from 3 to 4, the extensions will go from 221 to 2221 (for example), but I believe everything else remains the same. Only did this once about 3 years ago, so if I'm incorrect, someone else please chime in.
Only consideration to remember is that you can't renumber/change the length of the DN's in voicemail. You'll have to out/rebuild the mailboxes, unless people don't mind keeping a three digit mailbox number, but that may get confusing for the users.
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