Yes, bob...I am doing so on 2 different planes.

For the most part, you can pretty much match any servos and receiver you want to (as far as brands go) There may be (as is the case with what you ask) some minor modifications to be made)

In this case, you'll need to make one small mod, and keep something in mind:

The Futaba servos will have a small flange on on side of their connector...this flange will prevent them from plugging into your JR receiver. (It's there to keep you from plugging it in the wrong way on a Futaba receiver). You can easily trim this flange off with a hobby knife, and the connectors will fit in the JR receiver no problem.

Once you do this, however, you'll have nothing preventing you from plugging in the connectors the wrong way.

On MY receiver (an R700 slimline) the white wire goes to the same side as the printing on the receiver. Whether or not that's the case with other JR receivers I do not know. Might want to do some research on your particular model of receiver and servos.

HTH