Is it possible to make an original '71 edit using the letterbox laserdisc? Being how people who’ve seen the Grindhouse version say the only real differences are a few scenes near the middle have been switched around, and an extended scene with SEN and the boys (does this mean the '71 verson has the 30 extra seconds or the '78 edit)?

I know the color timing of the widescreen LD’s have been altered (both US and Japan) but Cedric T Sealion said the original P&S NTSC vhs has the correct timing. I’m wondering if the first Japan P&S laserdisc is the same as this vhs he’s talking about? (cat# 08JL-611620).