Solar experts....Matching solar panels help needed.

I did a little testing of the panels today before I mounted them on the roof. The panel voltage checked with a Fluke Multimeter and no load,wired in series and in pretty much full sun was 40.3 for the matched pair (2 Kyocera KC50 50 Watt) and for the unmatched pair(1 Kyocera KC50 50 W & 1 Newpowa 50W) it was 41.7. Does testing the voltage this way tell anything and does this seem like these panels are a pretty decent match?

Thanks!