I bought a new Winchester/Miroku '92 in .357 a couple of months ago. I immediately ordered Nate Kiowa Jones' DVD and spring kit for the Rossi, knowing that some tweaking of Rossi parts would be necessary.
The first thing that I noticed was that most of the work in the DVD has been done by Miroku. The carrier detent spring was as light as the one in the NKJ kit and the detent ball rides in groves in the receiver, not the cartridge guide like the Rossi. The cartridge follower is stainless, but I had to shorten the spring to get 10 .357 length rounds in the magazine. There was a sharp ledge just opposite where the rounds enter through the gate that had to be smoothed to keep from deforming the bullet nose. The ejector spring was way too strong and the NKJ replacement was a perfect replacement, I added a very little smoothing of the ejector shaft and collar that may or may not have been necessary. Again, the Miroku parts were very nice as is. The bottom of the bolt was already beveled, so all I had to do was a very little polishing. Of course the hammer spring was way too strong, but shorter than the Rossi replacement included in the kit due to the strut being shorter because of the rebounding hammer. If I remember correctly, I shortened the much lighter NKJ spring to a length in between the Miroku and Rossi length.
There is information online about substituting Ruger Vaquero springs of varying strengths, but I found it too late and the cut one seems to be working well. There is also info online about defeating the rebounding hammer. I did it and it worked, but proceed at your own risk and work slowly, replacement Miroku parts are difficult to come by.
That's about all I remember, it went very well. Only a couple of hours or so, and you'll be an expert at '92 assembly and disassembly by the time you're done. No, it's not as fast as the '73, but I'm a '92 lover and will likely sell my '73 to pay for a backup, probably a Rossi.
Shoot what you like, I'm a '92 guy through and through.