In general, any servo will work with any receiver.

There are some tiny receivers that have tiny connectors so they have to have servos with the same connector.

Very old Futaba equipment had what is called the G connector before they started using the J connector. You're not likely to find a lot of this, because it is very old, but it does exist.

Airtronics used to use an odd connector, and the wiring in the conector was in a different order than everyone else. Their current Z connector is compatible with just about everything.

Some connectors have one corner slightly beveled. A hobby knife can make the bevel in a few seconds. Sometimes the J tab needs to be shaved off of a Futaba servo to fit a different brand receiver. Again, it takes a few seconds with a hobby knife.