ray_afraid said:

Thanks for the info! Having both versions would be ideal, so that's great! (Take notes, George!) It's also good to know that the versions I'm watching only have updated effects and not added content or altered scenes.

There are maybe two shots of live action that were replaced, new establishing shots, but you are watching the original edits of the episodes. The original plan was to only replace the space shots and fix the mattes, and that's usually all they had time for.