The Hitec transmitter you have sends out a Negative shift signal and JR requires a Positive shift. Futaba uses Negative shift signals so you can use their receivers but you will likely find the Hitec stuff cheaper and just as good... Oh and Tower Hobbies brand receivers are just Futaba with different stickers on the face.

EDIT// Oh just read the fine print on your radio. It is Shift Selectable so yes that JR flight pack should work.