Re: C-25?

In addition to the class number, you also need to compare the drawing number. Even then there could be some minor differences between locomotives of the same class and drawing number. D&RGW #375 was original Crystal River RR #103, which was Baldwin class number 10-30E26, drawing number 7. Below are the other class 10-30E drawing 7 locomotives.

Copper Queen Consolidated Mining Co. #4, 10-30E105, drawing number 7
Phelps Dodge & Co., 10-30E108, drawing number 7
Shannon Arizona Railway #1 & #2, 10-30E111-112, drawing number 7
Quincy Mining Co. #6, 10-30E135, drawing number 7

Several of those ought to be recognizable. You should also check the erecting drawings as well as the specs. for differences. The DeGolyer Library at SMU has the erecting drawings for Crystal River #103, Copper Queen Consolidated Mining #4, and Shannon Arizona #1.
Dave