If I understood you correctly, that's also a 1000-foot reel change (12676)msycamore said:
You can actually see some small amount of shrinking in the SC telecine as well, see the first wipe in the film to Tatooine for example, the bottom border gets a little larger as it progress. Another thing to watch unrelated to this is the last shootout scene right before Vader makes his entrance on the blockade runner, it actually looks like they spliced in a different source for that short sequence.
just like the other shrinks (70632 & 128032) are 1000-ft changeovers.