From an earlier post of mine I had noted;
I assume that 4" space is to account for the caliper.
If we consider that the Copen has a 246mm rotor when we select that in this look up;
https://www.supercheapauto.com.au/on/demandware.store/Sites-supercheap-au-Site/en_AU/PartsGuide-Show
1"=2.54cm, thus 24.6cm/2.54 = 9.68" so in theory they should readily fit on 14".
Here is a more concise technical method;
If you used the ruler method they outlined you will get a decent idea but all you need to do is ask James;
@applegeek897 is running 14" rims on his build and has Copen calipers;