The AZ Altazimuth Mount is for:
This flash upgradable Celestron NexStar hand control is compatible with all Altazimuth mounted NexStars, including SLT, LCM, SE and CPC series computerized telescopes.

The EQ Equatorial Mount is for:
This flash upgradable Celestron NexStar hand control is compatible with all Equatorial mounted computerized telescopes, including Advanced, CGEM, CGEM DX and CGE Pro series