I guess Pimoroni is not guessing it is CYW43439 Image may be NSFW.FCC approval for the 'RM2' offering - Application details and exhibits still to come -
https://fcc.report/FCC-ID/2ABCB-RMC2GW4B52
W4 = WiFi 4 - 802.11n ?
B52 = Bluetooth 5.2 ?
Clik here to view.

Yes, antenna performance will be probably the only difference.
Statistics: Posted by MatSOBDev2 — Fri Oct 11, 2024 12:19 am