Can Airtronics/JR servos be used with Futaba compatible reciever?

How about this. I have a couple of Crystals in my channel that I do not know the origin of. I was hoping to use them in recivers bought now to outfit other planes. They are marked with "FM RX" but do not say anything else other than the Frequency.

Is this more for the trial and error?

Thanks again for the help.