The bolt handle itself is differently placed. They won't swap. Even in a nonfunctional way. (Unless you were to butcher your rare receiver!-) It seems a terrible shame to get in a rush at this point.
1885 Model below (this is actually a "parts source gun" for my "nice" 1885 that I bought "just in case" for little more than the price of the magazine alone!):
Versus the 1879:
If you want just a display bolt that can't function, it ought to be feasible to use a bit of metal tubing and some creative wood carving along with epoxy and paint to fashion a dummy for very little expense. Good enough for static display until the real thing comes along.
The bolt on my rifle should be identical in all respects to what was in yours. It even has the cartridge retracting groove on the underside. S/N is only 3-400 off. Plenty of photos to go by too, so it'll look good at five feet- given a little attention to detail.