Unfortunately, according to Mike Swanson's
NexStar Hand Control Version 4 User's Guide, it is not quite that simple. Although outwardly all recent Celestron hand controls are the same, some GT controllers are user-upgradeable and apparently can drive SE's, but later-model GT controllers cannot.
If you plug the unit into the scope, turn on, select Menu, then Utilities and Version, the display will show HC: ____ and MC:____ ____ (these are the Hand Control and Motor Control firmware versions). Then press Undo, which will show Mount Model: ____. Can you please advise what the HC, MC and Mount Model results are for your one.
Thanks.