^^Double that! Rangers are 5x4.5 bolt pattern(or circle). As long as the bolt pattern is the same, your good to go. I don't think i've ever seen an aftermarket RWD wheel that's too sucked in for a ranger(in regard to backspace). No kit.
But since you are getting stock to stock, assuming ranger 14" to ranger 15", your definately good to go when it comes to backspace. heck, you could even run ranger 16" if you want. Just remember, 15" wheels are for 15" tires......