I believe it will work with the original Shogun, based on the thread created here by Irinami called "Ronin Ramblings," a couple of months back. As the original Shogun only has the Sengoku Jidai campaign, you don't have to worry about choosing the wrong one. Just start a campaign, go to the first turn on the Strategy Map, and then type:

.conan.

You should then be in control of the R&R. Note that, in Irinami's thread, it became apparent that in the original Shogun you can produce strategic agents (Shinobi, emissaries, etc.) as the R&R, which makes it even easier to win if you choose to use them to start rebellions and to bribe armies (any rebels automatically become yours to control, and spies create rebellions, etc. ...). If you find this too easy, I suggest playing the R&R without using emissaries, spies, ninja, or geishas. This is how it works in STW-MI/WE and makes it a bit more challenging.

The R&R campaign is great for a "blitzkrieg" military expansionist strategy. When I play it, I try to take over the map as quickly as possible.