Yeah. Cimarron is a little bizarre the way they label 'Pre-War' and 'Old Model'
The generally accepted terms are Black Powder Frame, for the ones with an angled screw at the front of the frame to hold the cylinder pin in place.
The so called 'Smokeless Frame' with the spring loaded transverse pin to hold the cylinder pin in place first appeared as a target model feature in 1892, and became standard around 1896. But this was four years before Colt officially factory warrantied the SAA for Smokeless powder in 1900. So with the old guns, the term Smokeless Frame can be misleading.
Modern revolvers are made of modern steel, so the Black Powder frame models as well as the Smokeless Frame models can all be safely fired with Smokeless powder.
I suspect Cimarron is using the term Pre-War to denote a Pre-WWII style frame. Colt production of the SAA ceased during the war years, and did not start up again until 1956, which was the beginning of the 2nd Generation of SAA production.