What's the difference between RAK2245 and RAK831

[Steven (Steven Tang)]

there is a document have summaried all the difference .
http://docs.rakwireless.com/en/LoRa/RAK2245-Pi-HAT/Hardware-Specification/RAK2245_RAK831_Design_Guide_Comparison.pdf

[sergi_jini (Sergi)]

Thanks for the doc Steven