What is the difference between a 4 Cylinder C 2.0L and a 4 Cylinder Y 2.0L?

generically,

C and Y would typically define the engine family. while they do have the same displacement, the engine configuration is likely different.

different family engines don't *always* denote different model or vehicle years.

Probably the model type pretty much their the same size to the fact that both has the same liters and cylinders. Check Car manual to see what makes the difference if not check manufacurers official website.

it a diferent year motor