injector scaling question

if you had a set of x brand injectors you don't have data for. Is it possible if you put in stock injector data and did the math to find the % difference between your stock injectors and new set of injectors and just upped the tables by that % amount would that get you close? (Using HP tuners here) reason im asking is I have a set of injectors that's been in the car for a while. base map that I had from pervious hand held tuner works fine for e85 and 93 oct for cruise and WOT but has always idles lean to the point it don't show on the a/f gauge as a number anymore.

i would recommend sending them to be tested and data gathered to save a headache or 2

Regards ross