If you have a Humminbird Down Imaging unit, yes you can use the transom transducer for shoot-thru.
The XNT 9 DI T is the transom version with a transom bracket.
The XIH 9 DI T is the shoot-thru version and comes with epoxy.
They are the same transducer.
Humminbird Helix 12 SI, 1198c SI, 1198c SI, ONIX 10 SI NT, 360, RC-1