Yes, correct, the unpopulated holes all look to be and measure the same, both rows of them. I was unable to fully seat the 3 pin header by hand, just barely got it started. It was harder than I thought from my first attempt at lining it up for fit. Ended up having to use a small pair of flat nosed pliers to fully seat it tightly in the holes. Just have to make sure the pliers clear bottom pins while pressing it through the PCB.
With a magnifying glass and a meter I was able to trace the 3 holes used for the pin header to their connected components and got good continuity on all three pins! Checked each pin a few times to be certain.
I was even able to remove the 3 pin 'press fit' header without damaging anything. Had to gently and very carefully pry it up with a small screw driver. As another test, I reseated it a second time (still needed pliers) and it all checked out the second time as well. These seem to work quite well, great find GRJ! Looks like we have a winner here!