the same chord progressions have been used in tens of thousands of rock'n'roll songs. chord progressions are not patented. plus, if we're talking progressions of five or so chords, it's perfectly possible for two, three, however many artists, to come up with identical progressions independently of having heard the work of the others.
if i looked hard enough i could find numerous works of classical music written for guitar/piano that have parts based around the same progression in stairway. it's not even a particularly unique, interesting, unusual progression. it's quite musically logical and straightforward. somebody might think to do it in mere improvisational work.
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