Colleges aren’t admitting you based only on your senior schedule, but they may consider everything in your application and a discrepancy may raise a flag. It also may be an issue if they require certain classes which will not be met due to the change.
Simply send the admissions contact at each school a revised senior schedule. If you feel it deserves an explanation, provide a brief one. Whenever something changes that may be of any significance you should update your application accordingly.