Hey Snewpy
The receiver is probably an older one, without the lipo compatibility jumper, but it will otherwise be the same. If you are lucky enough to have a late model one, with the 3 jumpers, then its all great for you. Either way you can use the receiver, old or new, with no problems unless you intend to Lipo's. Lipo's should only be used with the newer RX

The jumper settings for the newer one used in F27B's are....

J1 no jumper = Flight trak
J2 no Jumper = Vtail elevon mix
J3 sets lipo mode.....jumper = 6-9 cell No Jumper = 3S lipo

Have Fun....Remember..... the ground only hurts when you hit it!
Mike