i may be completly wrong here but anyways ....
A4 is approx 8.26"x11.6" so if you printing a model that was supposed to be for A4 you are printing it at a slight reduction in scale ...as far as im aware that should not be a problem as ive done the opposite many times before.printed a model based on u.s letter size onto A4.
hope this helps ,, and sorry if its the wrong answer...
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