No, there are two flavors of 45 Graphmatics. Catalog 1168 is for Graflex, 1268 for Graphic. There is a decal on the back saying Graphmatic for Graflex or Graphic and the catalog number. Also, the Graphic one has a ridge across the top, just like a standard sheet film holder, the Graflex version has a slot matching the ridge on the Graflex back.
I have no financial interest in it, but I notice that there is a Graphmatic for Graflex on epay right now as well as a 45 bag mag. There are instructions for these on the Graflex.org site.
Curiously, the 2 1/4 x 3 1/4 size of the Graphmatic is designed to fit either a Graphic or Graphlex back - to my knowledge the only accessory that will fit either back.