It's not because those 2 common chords are shared (here and in countless other songs) it's because of where they're placed, the ringing out resolve, identical soft strum pattern and context tempo which combine to make it so prominent.
In both this and "Delicate" they come right at the end of the instrumental introduction and sustain in an otherwise silence immediately before the first line is sung which makes for something of a hook (and I'd argue it's the pulloff rather than the hammer-ons since those aren't what's shared). Had he buried them under the melody it probably wouldn't have made anyone even notice.
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