Different Tusk mixes

[John]

Forgive me if this has been discussed before at some point. I've been a fan of FM since the 70's and bought all their albums when they first came out on vinyl (or in one case, cassette). A while back I picked up Tusk on CD and noticed a few songs are mixed different than the vinyl version, most notably I Know I'm Not Wrong (which I prefer the vinyl version much better). There are a couple other songs that seem very slightly different also, anyone else ever notice this? Also does anyone know if there is a CD version of Tusk out there with the "original" mixes of these songs? Thanks