The 'Works on keyboards with same type' Trigger Condition doesn't seem to restrict it to the keyboard I originally used

[Andreas_Hegenberg]

Mh that should definitely work, I use it all the time to remap e.g. Logitech buttons.
One restriction: it will not work if another app has taken exclusive lock /control over the keyboard (e.g. Karabiner Elements)

This is because then BTT needs to fall back to the higher level system API's, which don't allow to get the keyboard type.