CapableMetal said:

I didn't do all six films in the end, just the 97SE trilogy. They sync to the standards that a few of us figured out between us a while back. The NTSC laserdiscs aren't all we've got and are actually missing frames. The digital broadcasts are far more complete, as are the PAL laserdiscs and after comparing the various releases together we discovered that between them they are frame accurate to the official DVD and Blu-Ray releases. The only exception was a single missing frame in TESB, which we decided to include as the standard because it would conform to the DVD video frame count.

I don't have TPM on laserdisc, so my only source for that would be the digital broadcast of the theatrical version. Frame counts for the prequels weren't discussed at the time, and I never investigated them properly because I find it very difficult to watch them without sighing in disappointment throughout most of the films. I might have a crack at them some day, but I don't know whether there is enough of a difference between the lossless tracks on the Blu-Ray's (at least for AOTC and ROTS) to actually be worthwhile.

I'm not sure if you refer to actually owning the laserdisc or just a preservation, but you should grab althor's Japanese Laserdisc on myspleen. The laserdisc is the theatrical cut so you could theoretically synch it to that. AOTC doesn't have a "theatrical" version released aside from the bootleg recording which is undoubtedly missing frames.