I recall there being confusion about this a while back until we finally got it sorted out. As Harmy indicated, what's going on here is that there are three different composites of this scene that were made over the years. The first being the original from 1977, with no episode number or title; the second was the 1981 version, in which 'Episode IV A New Hope' was added and the starfield background was changed to one that had been used in The Empire Strikes Back; and the third having been made in 1997 for the Special Edition, which retained the 1981 version of the text but returned to the original 1977 starfield.
Assuming I'm understanding what you're saying correctly, Mike, it appears that all the elements of the 1981 version were reused for the SE (aside from the starfield background), including the timing of the laser blasts and explosions relative to the beginning, and also the total number of frames in the shot. Both the 1981 and 1997 versions appear to be missing one frame compared to the original (the 'STAR WARS' title card must come in a frame late, and both the Technicolor print and the Bluray are missing an additional frame at the end of the shot, accounting for the total 2 frame discrepancy).
Undoubtedly this timing difference was a mistake introduced in 1981 when the shot was redone for the first time, and not intentional; the error would then have been unknowingly carried over into the special edition since no one knew there had been a mistake there in the first place. Any discrepancy in audio synch would probably have been small enough to have gone unnoticed since the tracks were not remixed in 1981. Due to the aural character of the sound effects used in this scene, being somewhat drawn out in duration and of unusual timbre, small timing errors with respect to the picture would be harder to pick up on than might be expected.
Going from these logical conclusions, it is then easy to assert that only the 1977 original, as agreed upon by both the Kodak print and the 2006 DVD, should be considered an authoritative representation of the timing for this scene. The 1981 and SE versions can be safely disregarded.