Depends exactly how "recent" they mean.....

There are at two modems used in fairly recent Macs. They look almost identical, but one has a longer connector than the other. I think I'm right in saying the shorter connector one is the more recent of the two.
This is from memory, so it may be wrong, but I think the B&W used the same modem as the Lombard and Pismo PowerBooks, possibly the Wallstreet (maybe even Kanga, no idea) and the early G4 PowerMacs. I cannot tell you exactly when the changover from long connector to short ocurred, but I'm pretty sure the MDD uses the short one. And probably the QS too. Maybe even some of the G5s. Modem speeds haven't really changed very recently for dial-up, so why bother changing the design? (They really ought to offer internal DSL as least as an optional replacement for the 56k modem in new Macs. And AP basestations too. But I digress....)

Hope this is vaguely helpful.......