Having gone to see T2: 3D before the ride closed, I vaguely remember a more teal color palette. That being said, I believe they were still using film to project, making a new retimed DCP unlikely.
My guess is that the old camcorders don't show the teal due to the limited color fidelity of the SD recording technology of the time. Would definitely trust more modern recordings. Similarly, the bootleg workprints circulating could have been altered during whatever crude transfer was made...
That being said, there were, at one point, three iterations of this ride around the world. It's possible, though unlikely each has different color timing, and the various cams are records of different rides.