But in the model list of this library, there are other 0603 sized capacitors..
So I was wondering if the sizes are the same, but the capcitors are different, I can use the footprint of another 0603 capacitor since all I need is the footprint.
In IPC-7351, board density levels A-C (maximum, nominal, least) have been defined, resulting in different land pattern dimensions. PCB foorprint libraries should refer to this density levels, see e.g. Altium Designer.