No, both mods are complete overhauls of the game.
No, also, overhaul mods are not saved games compatible.
The beauty of I.S. is that you can play I.S and regular Empire at the same time (different games). I.S Mod does not "gut" the files so that you have to re download the game when you decide to uninstall the mod.
ImperialSplendour
joined
Imperial Splendour attempts to create the best Empire: Total War experience possible without destroying the essence of the game, with an eye towards expanding and enriching the experience, while adding to the game's realism whenever possible. The greatest innovation in that release of Imperial Splendour is the evolution of the uniforms, separating the Grand Campaign into three periods (Early, Middle, Late). Each period allows you a different roster so as to be the most historically accurate. The uniform changes by stages and by revolution, so as to be consistent to correspond with major conflicts of the 18th century. A second aspect of Imperial Splendour is to offer a unique game- play experience with each faction. MODDERS WANTED: Imperial Splendour is a multiple award winning mod and we are always looking for enthusiastic and talented modders with basic (novice) to highly experience skills to join our team and exciting project. If interested please send us an email.