Do you practice or do you rehearse?

Yes there’s a difference.

When a band gets together in a studio, they rehearse.
This is because they will go over the same song time and time again.

But when Wing Chun students get together, they should practice.
Because even though they may be going over the same drills such as Chi Sau / Dan Chi Sau / Pak Sau Techniques etc. time and time again, they should still be staying in the moment and keeping prepared for anything.
NOT, just doing their same favourite technique every time.

This is the difference between practicing and rehearsing.