Are you saying you can't load 1.13 savegames in 1.14, or you can't load any savegames/replays, period, even ones made after the patch?
Unlike FPSs and such, a tweak made to a strategy game will almost universally break savegames, regardless of the game or developer.
If you were just playing your first or second game - start a new one. You will have to play 4 or 5 games before you really get a handle on all of the stuff.