How to tell two categorical arrays with different categories names are the same

Assume I have two categorical arrays as for example the following:

X=[1,1,2,3];
y=[3,3,1,2];

The two arrays have different classes names (categories) but in the classification task they have the same classes. How could I tell that the two arrays are the same (have the same categories)?

Answer 1

[Peter Perkins]

You don't have categorical arrays, you have numeric arrays. If you had categorical arrays, you'd just look at their categories.