Since we're hung up on comm badges, I suggest we list all the episodes where alternate comm badges were used.
On the TNG show, I believe there were only 4 instances of alternate communicator badges being seen
Future Imperfect featured a combadge with stripes signifying rank, in place of pips
Parallels featured the same one, used along with the traditional rank pips
All Good things featured a futuristic looking combadge
& Yesterday's Enterprise featured the combadge worn at the time of the Ent-C
Seen here, being used by Castillo