Noticeable differences! In a complex engrave, it might pay to do a 2nd sample that compared the time of the most-preferred .2 result to the most-preferred .3 result. It would be easy to chose the combination that fit your needs.
I just realized you can use the artifacts in the auto engraves as design elements. If you have related but individual pieces that will be engraved, you can orient some 90 degrees to the engraves of the others. This is assuming the designs are not quadrilateral and have the same ‘up’ orientation.