Hi,
I'm more than happy to go through the differences. Should you have any questions please do not hestitate to let me know.
RM6501K (All RMXX01K series)
4K native resolution
Android OS
EZWrite 4.1 Lite - Android based whiteboarding software, including handwriting recognition
InstaQshare (cast the Android OS out to up to 16 devices on the same network and mirror your device to the screen)
Floating toolbar (accessible from any input)
Anti-glare coating
Integrated soundbar
LAN (RJ45 socket) as standard - optional wireless dongle
FREE lifetime license for Windows based Oktopus whiteboard software
RP6501K (All RPXX01K series)
4K native resolution
Android OS
EZWrite 5.0 - Android based whiteboarding software, including handwriting recognition, cloud collaboration between any device
InstaQshare (cast the Android OS or HDMI input out to up to 16 devices on the same network and mirror your device to the screen)
Floating toolbar (accessible from any input)
AMS - Account system, either local accounts (per screen) or cloud accounts (cloud based), including cloud storage (One Drive, Drop box, Google Drive)
NFC sensor which cane be used with AMS
DMS - cloud based system managment
Voice controls (via included remote) - internet connection required
Anti-glare coating
Anti-bacterial coating
Integrated soundbar
LAN (RJ45 socket) as standard - optional wireless dongle
FREE lifetime license for Windows based Oktopus whiteboard software