When I use GEDCOMpare where the gedcom has the following lines about the name of a person,
1 NAME Jon /Månsson Lärka/
2 GIVN Jon
2 SURN Månsson, Lärka
he is shown only as "Jon Månsson" when a comparison is shown. It would be easier to determine if there is a match or not if his full name as given in the gedcom was shown. This file uses Gedcom v5.5.1, and the specification says "Different surnames are separated by a comma".