To the best of my knowledge, there have only been 4 official mixes of the parade created for distribution:
A - one created for early Disneyland/Walt Disney World OAs (including the original picture vinyls)
B - one created for Disneyland's Fantasmic! release (stereo, missing some elements, complete loops)
C - one created for Tokyo Disneyland albums ("cleanest" mix, includes the character voices)
D - one created for Disneyland Paris albums (mono, but created from the actual audio used in the parks)
These four mixes have been hacked and cut so many times. A few examples:
Disneyland/Walt Disney World vinyls - use mix A without announcement
Official Albums - use mix A, announcement bed truncated
A Legacy in Song - uses mix B, some loops truncated
Don Dorsey promo CD - uses mix B
Disney's 75 Years set - uses mix B, some loops truncated
Magic Kingdom presents Main Street Electrical Parade - uses mix B, some loops truncated
Dreamlights CD - uses mix C
Disney's Electrical Parade from DCA - uses mix C
Disneyland 50th - uses mix C from DCA album, some loops truncated
Given the amount of individual elements that make up these tracks, I would presume its a nightmare to try to commission an entire remix. The Disneyland Paris mix gets it dead-on, but park tracks are usually mixed as a single channel because its difficult to tell where the guest might experience the medley. The other mixes are missing elements here and there. The Tokyo mix is the best sounding mix, with the instruments keyed and reverbed quite nicely to give it more of a "studio" performance.