Good catch--I never even noticed the different-shaped camera opening. FWIW, the LaView also advertises a Sony Starlight sensor whereas the RCA and other variants don't. So I guess I'm not 100% positive if the LaView is identical under the hood or not. Obviously someone should buy the LaView version to compare 
Edit: FWIW the other two rebadges I'm aware of look like the LaView:
EZVIZ DB1: 
EZVIZ - a global smart home security brand (really confusing model #)
Norelco SC-DB313W: 
SC-DB313W
Edit 2: 
This video from RCA (2:41 mark) shows the doorbell lens itself is embossed into the pill-size shape to line up with their faceplates. So it looks like the RCA plates won't be compatible with any of the other versions.