Looking at the first three frames russs15 posted in the link below, 1984-9, I would be a bit sceptical that even if the exact same master is thought to be used for consecutive versions over a period of years, that some minor differences might still not emerge. It depends if you think these are worth spending time (or money) investigating. Maybe some people in the early days of the forum already investigated all this and laserdisc won everytime so there was no vhs preservations worth archiving. But what if a specific aspect fell through the cracks?

http://originaltrilogy.com/forum/topic.cfm/Help-Im-new/post/582999/#TopicPost582999

I'm interested to know if the tapes from different european countries were any different or australian tapes??