If the other plugs have not moved or started to leak, then they should not need replacement. Inspect all of the plugs to see if any have started to move. If any did, it may be possible to just tap it back in place.
I had a '63 Ford Thunderbird that blew out one of the freeze plugs and another one that moved slightly. I replaced the blown one and tapped the one that moved back in. I did not experience any problems from the one that I tapped back in. YMMV