>An American Tail (1986) 1987 US CAV Laserdisc 40536
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This version is in open matte and includes the original theatrical audio from the LD's digital PCM track.
The 5.1 remix used on DVD/BD is heavily altered, and includes alternate music cues, added cartoony SFX and added/alternate voice lines. (most notably the orphans near the end, who have kid voices in the original but adult voices in the remix)
Theory is that the 5.1 remix used an earlier version of the stems by accident, and Universal never bothered fixing it. It doesn't seem like any of it was newly recorded for the DVD, as the remix-only music cues showed up on the full soundtrack release a few years back.
This LDrip includes the (LD only) special presentation and trailer from the end of Side 3.

>An American Tail (1986) 2003 US DVD Remux + Theatrical Mix
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The Blu-ray is a DVNR'd mess, but the open matte DVD looks perfectly fine. This remux adds the (synced) theatrical audio from the Laserdisc.