Another way to look at it;
If a 3/4 track is used to create 4/4 realtracks, it can only take a 3/4 'bar' sample and add another beat, so you'll likely end up with an accent on 4 & 1 of each measure of the pattern (due to the extra beat being added). 123+1 123+1 123+1
This sounds 'off'

If you do the opposite;
A 4/4 track is used to create 3/4 realtracks, the 4th beat is removed and the accent continues on the 1 of each measure. 123 123 123
This sounds much more real. The first beat of a measure 'fits'.

Make your sound your own!
.. I do not work here, but the benefits are still awesome