Their style "Zebrawood Regular" is a close match to the more ornate font used for the show's main-title credits. (I think I have seen that kind of font also referred to as "Playbill.") Their "Buffalo Gal" is similar, though not identical, to the simpler, end-title font, which also goes by many different names, including "Western" or "Wanted Poster."
My advice would be to get onto Google and search away to your heart's content. The age of PCs has brought us many immediate gratifications. This is one of them.
I have used the Letraset font Romantiques as press-on lettering as a close match to the ornate later season titles (I believe the font is also called Tuscan). Fonts called Wanted Poster, Playbill, etc. are fine for the first season titles.