That's the thing. In the pictures he provided it "appears" there is around a 1/16th of an inch difference. Pushrods of an incorrect length can cause either a lack of preload on the lifter (noisy valve train) or the opposite and bottom out the lifter in its bore. It appears you may have a make it run get it down the road rebuild. Not a huge deal if that is what you expected.
Just for S&G can you post a pictures of the top several of the valve tips. I'd like to see the wear pattern.