How to use AT+QCFG="usbnet" EM160R-GL & RM520NGL

ARE THE SAME COMMANDS APPLICABLE TO EM160R-GL & RM520NGL?

AT+QCFG=“usbnet”,0 - is PPP & QMI (default)
AT+QCFG=“usbnet”,1 - is ECM.
AT+QCFG=“usbnet”,2 - is MBIM

are there some more?

You can check with AT+QCFG=? and see what values are valid for "usbnet".