It is, if you really really know how to configure around the built-in LoRaWAN stack that’s already present on the Murata module - but why would you - you’ve got a top grade module with the official LoRaMAC on it.
But that’s not important, because you have a 33 Nano and you can not send AT commands to the Dragino board which is how the MKRWAN library works because there is not serial port on the board for the RFM95 radio because it doesn’t have a serial port.
Four days ago I said you were OK to use pins 2 & 3. You can use any pins you like that aren’t for the SPI (which also needs connecting). You could have had it running 3.5 days ago …