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The epoch is the reference point (year) for the star positions (RA & DEC) since the stars are moving relative to eachother. If you mix up RA & DEC from catalogues with different epochs their relative positions won't be correct and this will impact Alignmaster's calculations of where the pole actually is causing an error in your polar alignment.
I used one of the Astroplanner catalogues to generate the RA and DEC for the stars in the file I attached.
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