There are often different reel change points on different releases, especially if one release was longer than another.

There are often a few frames missing around the reel change points on films that were run for a long time.

If checking the IB against the LD release, then I'd look to see if these frames exist on the LD.

If they are missing from the LD, then it is likely that the film has extra content, and would contain the sections from the LD as well.

If these frames *are* on the LD, then you can soon work out exactly where they are on the LD, and that should give you your answer.