What do you mean by lost? If the game was started with vanilla at 1.29F, it will play just fine in C3C patched to 1.22. If it was not started with 1.29f, it probably will not be able to be loaded.
In any event, the vanilla game will either load and be playable or not load at all. It get a dataio error if it is not compatable. Once you have saved the game in C3C at 1.22, you will not be able to play it without C3C.
The original save should still be in the orignal vanill save folder.