Mostly they are with a few exceptions:
The new hammer is slightly shorter at the top due to the frame change from large size to mid-size, but they do swap.
Transfer bars likely the same length but may need slight fitting.
The NV hand is different because it's a "free spin" hand. Without the little divot in the top of the trigger guard strap of the New Vaq, it may bind in an original Vaq. And without the parts below, the cyl will spin in both directions whenever the loading gate is open.
The NV also has three extra parts; the chamber alignment pawl, spring, and set screw in the hammer channel. These can be added to any original large frame Vaq by drilling and tapping one hole.