... um, Im very sure that they are the same.. Not 100% sure but. I dont have any extras. I threw them all out when I got the RB20 Injectors. Good luck with the search. But like I said I believe they are all the same as far as #'s.
as for price----
If you want go check for people parting out 89-90 ka24e s13's tell them you want the injectors, pay them 20 for all of them, soak those bastards in carb cleaner for an hour or two and then run fuel injector cleaner after you put them on the fuel rail and securely tighten the fuel rail down.

Q&A for you...
Why are you needing them??
leak?
running werid? (associating to FUEL problem)
or do you know if the injectors are bad??
fuel pump??
IF its a leak check your o-rings/spacers and lines.
If that doesnt work FUEL filter these are all things I had to do with my single cam coupe. But lol the motors isnt something to really flaunt about. lol I liked it because it was good on gas, and it had just enough torque for comfort. mine made 103whp/111ft and Asia989's made decent hp numbers when he had that motor. I liked it tho while I had it.
its definately a motor to keep if your using the car as a daily driver, as for high hp numbers single cams are looked at differently than twin cam KA's.
they are known to pop and top of that theres not a whole lot of shops that work with them.. lol sorry for making this replying with Single cam praise especially when I own an SR. t_t;
-Sean