The minute wheel is the same, it isn't the source of the roughness or the problem. The problem is the incompatibility of the rollie cannon pinion and the zenith center wheel.
Rolex replaces the center wheel (along with a bunch of other stuff) when the modify the zenith. The center wheel is the one that the cannon pinion fits onto, the one with the post sticking out. The reason you need a new center wheel, is that the rollie cannon pinion has a smaller diameter hole than the zenith, and the only fix is to remove the center wheel, mount it in a lathe, and turn down the post for the cannon pinion until it fits correctly.
There are many other issues and problems you are going to run into as soon as you start to change the parts, too many problems to mention and try and explain.
The old rule applies, you change 1 thing, you affect 12 others...
I have build a number of these and they are extremely time consuming as soon as you start to install rollie parts.
If you are doing the upgrade, or if you have someone doing it for you, I hope they are very very skilled watchmakers, otherwise your in for a rough ride, I still have the scars and emotional trauma from doing it myself...