The Vaquero has been out of production for quite a few years. I have several, both blued and stainless, in .45 Colt. Had one in .44 Mag but traded it for a Super Blackhawk long ago.
The gun in current production, and referred to as "Vaqueros" are not "Vaqueros" they are "NEW VAQUEROS", and they say that on them.
Even though the names are nearly identical, the guns are quite different, The Vaquero was built on the large (44cal size) frame, the same frame size as the new Model Blackhawk and Super Blackhawk, They are large, robust guns, and the origin of Ruger ONLY handloads and Ruger's reputation for being "tanks".
The NEW VAQUERO is a smaller, lighter gun, built on a smaller frame, one which is approximately the size of the Colt Single Action.
Most folks just say "Vaquero" and then its up to you and context to determine which Vaquero they are talking about.
Actual Vaqueros say "Vaquero" on the left side of the frame below the cylinder window. Current production guns say "New Vaquero" in that same spot. They are not the same, parts and accessories are not interchangeable.