CC in use. What can be removed without exploding stuff?

[J. M. Pescado]

No. THe only way to tell is to open up the career in SimPE and look at "fallback GUID". If the Fallback GUID is the same as the OBJD GUID, then you're safe. If it isn't, you're not safe: You have to change the Fallback to be the same, then load and re-save every single lot in your game first.