If you have the SX PRO it came with SX OS license and license is attached to a specific switch.
The dongle would still work on either just remember if you need the license file you started with again it is different on each SX PRO dongle
If your asking can you put both license on one sd and use same sd for both then I would say no (it would not pick right one for switch automatically).
If you just want to have seperate sd cards and use same dongle (any dongle style) it will work