I can not see any reason for the RNode flasher to make a difference between 433 and 868/915. The firmware files also do not make a difference between those frequencies.

https://github.com/markqvist/RNode_Firmware/releases/tag/1.85

Also when you have even a device configured with Columba for 868/915 and it is for 868/915, Columba just say next to the firmware version it is reading out of the RNode, the RNode would be a 433 device.