4-perf refers to height (as in 4 perfs high.) There aren't (supposed to be) any actual perforations across the horizontal.
In any event, I don't think you're getting what I'm actually saying as regards the cropping. I don't love borrowing screen grabs but, in this case, the Beaver caps will...
I can't imagine that would be the case.
You're assuming that we're seeing the full aperture in the current "full frame" (sic) transfer and that the area we're seeing today is the same exact area used to matte to 1.85 during its theatrical release. I'm in no way convinced of that.