The only servo incompatibility (can't JUST plug and go{well of any well known brand... can't say on the obscure stuff...}) in the last 10 to 20 years... Airtronics. They had a different wire order than anyone else (reversed + and - leads for the battery and servos)

Aritronics FINALLY got with the program and started using the same wiring order as everyone else... but that created another problem... Old Airtronics and new Airtronics, airborne components, don't mix.

You can get (or make) adapters to make things work though.

I can't remember if Airtronics uses the + or - shift.

All other airborne components... plug servos and batteries between brands (just leave old Airtronics out of it)

If you find a servo that has 4 wires... forget it. don't use it... some collecter may want it though.