Occupied Japan Bisque Winged Animals in Bases

What makes these seven sets all the same:

1. Stamped in green "Ucagco China Made in Occupied Japan"
2. All stand about 3'' in height with 3 and 1 pour holes
3. All have a bisque unglazed finish

What makes these seven sets different:

1. Three have vests; four don't
2. The bases and attached stems differ

So are they one large series?  Or two smaller series of clothed and unclothed feathered friends?  You decide.