That is correct.
I would like to note that since the devices have different switch architecture, options related to physical interface and switch settings should not be copied from /network file.
Also, devices differ in firmware versions and product codes, thus only sections from /system file should be copied.
The rest should not disrupt device operation, as long as their firmware versions match (RUT9M_R_00.07.02.7 to RUT9_R_00.07.02.7). Also, relevant packages (MQTT, MODBUS) will have to be installed manually.