A photo of the Jedediah Smith pistol appears on page 89 of "Firearms of the American West 1803-1865". The caption states...
"Percussion pistol, converted from flintlock, carried by the explorer and mountain man Jedediah Smith. It's current location, following it's theft a few years ago from a West Coast museum, is unfortunately not known. (Courtesy Pacific Center for Western Historical Studies, University of the Pacific)"
The text doesn't state who made the pistol. The photo isn't of high quality, but it doesn't look like a Creamer to me. His work seemed to be higher quality. All but one of the Creamer pistol photos I have show the barrel keys entering from the lock side. In other words, the key head is on the lock side. The Smith pistol has the end of the key on the lock side, which indicates the head is on the opposite side. If it did have Creamer's signature on it, I believe the authors would make note of it. They write quite extensively about Creamer.
Here is the entire text written about the Smith pistol...
"Jedediah Smith was carring (this typo is in the book) a silver-mounted pair of percussion pistols, made along the classic dueling lines, when Comanches killed him on the Cimarron River in 1831."
Maybe you can obtain better photos by contacting the university...
https://www.pacific.edu/