Thanks for the tip. Not sure if those green circles mean thru-hole or not, but it’s certainly got pads for SMD.
I downloaded the pair of sch/brd files and tried to do something useful with it in Eagle. I removed everything but the Photon layout itself. It’s not clear to me that I’m getting somewhere helpful. Being on the bottom of the board may not be too bad, I can change part layers. But I couldn’t “extract” this to a “library part” such that I could add it to my other board layout. Or maybe it is a library part already … never having done anything but “use a part from a library” means I still have a lot to learn.
Short of a library part with known SMD headers, I think my best step may be to grab a pair of SMD header parts from the Eagle lib, identify the header spacing of the Photon header pins, then set them in place. Add a couple of restrict regions as the thru-hole parts show, and iterate.