To what extent can you mix button cell batteries?
CR2032, CR2450N, CR3032 are different sizes. That is the only difference.

CR2032:
C - Lithium.
R - Round.
20 - Millimeter diameter.
3(.)2 - Millimeters high -- note the implicit decimal point!

The size determines the amount of material it can fit, larger cell has a larger capacity.

You could try if an CR2025 fits your device, some holders can handle more sizes.