I got another batch of wireless keypads that, from the outside, look identical to the previous set:

The keypad on the right reports Model ID 0x4182, the same as the black plastic batch, and different from the 0x4101 of the previous batch (on the left). Apparently, the small USB dongle carries the Model ID data and the keypads can carry anybody’s logo.
The Vendor ID, of course, still shows Creative Lab’s 0x062a and all the serial numbers are 1.
Fortunately, the udev rules already have that combination and the streaming player can’t tell the difference.
Those labels on the keytops still don’t quite fit, but we’re coping as best we can.