I have done a little searching and it appears that older devices make use of a USB to Serial converter to provide the interface, and these appears as /dev/ttyUSB? ..... where "?" is a number.
Newer devices apparently have an on-chip USB port, and these appear to the system as /dev/ACM?
I don't have devices to test out, but it would seem from your test above, that inserting the device, running that ls command, and running the command without the devices inserted, should show - at minimum - which type of interface is being used by a particular device ----- ttyUSB or ttyACM.
That should help narrow it down to a few options for the user.
Of course please bear in mind that I have no personal experience of the above and am basing it on my interpretation of what I read ..... in other words YMMV