The 14 will be better.

The 19 shown above has a recessed cylinder, the model 16-4 does not have a recessed cylinder. The small protrusion (on the frame at the bottom of the cylinder window) keeps the cylinder trapped against the yolk when the cylinder swings open. If you use the model 19 frame with a non-recessed cylinder (shorter), the cylinder can slide back farther after the the cylinder is released. That means you would have to tilt the gun forward, or push the cylinder forward every time before closing the cylinder during reloads.