Howdy
Not quite. Ruger produced the Vaquero, which I like to call the 'original model' Vaquero from 1993 until 2005. This gun was basically the same as the New Model Blackhawk, with the frame and cylinder the same size as the Blackhawk. The Cylinder Frame was the same as the Blackhawk, except the configuration of the top strap was more like a Single Action Colt, with the rear sight being a groove milled into the strap. The adjustable sight was gone from the Vaquero. Minor differences of the Vaquero and the Blackhawk was the Grip Frame, not the Cylinder Frame, of the Vaquero was made of steel, vs the aluminum Grip Frame of the Blackhawk. If I recall correctly, the early Vaqueros had the same aluminum ejector rod housing as the Blackhawk, but this was later changed to steel.
The New Vaquero appeared in 2005. It was conceived as an answer to the needs of Cowboy Action Shooters. The Blackhawk and Vaquero had always been large guns, significantly larger than the Colt Single Action Army. That was why they were so strong, because the cylinder was massive. The Cylinder and Cylinder Frame of the New Vaquero are scaled down in size about 10% to close to the the same size as the Colt SAA. The Cylinder Frame, Grip Frame, and Ejector Housing of the New Vaquero have always been made of steel, there is no aluminum in them anywhere.
When Ruger introduced the New Vaquero, they ceased production of the 'original model' Vaquero. A few were still available from inventory, but not many. Very recently, Ruger has produced some of the 'original model' Vaqueros exclusively for distribution by the large distributors like Davidsons. These share all the features of the other 'large frame' 'original model' Vaqueros. But they are not New Vaqueros. The New Vaquero continues to be built with the smaller cylinder and frame. These current, limited edition larger style Vaqueros are the old style Vaquero, not New Vaqueros.
Confused?
Here is a photo of a 7 1/2" 'original model' Vaquero and a pair of 4 5/8" New Vaqueros. Perhaps you can detect the difference in size. I cannot answer your question about the respective weights, because of the difference in barrel length and caliber of the two models in the photo.
P.S. The big Vaquero has an after market cylinder pin, so ignore that.