I'm pretty sure the fuel rails on all the 6th gens were ALL different than the 5th gens. Those injectors won't be swappable.
That said, if you want that last mile per gallon, cleaning and flowing might really help. probably better than adding a higher flowing injector of a different type to the relatively primitive 5th gen injection. I flowed mine (also at RC, I think it cost me $24 each plus shipping) as my plugs definitely showed differences. Two were great, one was ok, one was dripping. Now they are all flowing between 240 and 241 and the throttle response in the midrange was noticeable when they went back in. The new plugs all looked the same last time I read them (5000 miles after the cleaning).
I don't know how much better mileage was as I had other problems there. But it's a hell of a lot less of an effort than modifying.