But just because it’s mono, does that mean it’s a different mix?
No, it could be (and likely is) just a stereo downmix. However, PSB had alternate dialogue which made it pretty easy to quickly distinguish. Without alternate dialogue and sound effects, you’d really have to listen carefully for mixing differences, which were also present in PSB’s audio. Maybe it’ll be like that–a different mix with no SFX or dialogue differences.
Wow, don’t know how I managed to miss that. It probably would be useful then, if possible, to include a laserdisc audio track.