Ken..
The radio itself is the same as the ART-13 it's the  power supplies  that the Navy used that  made  it the TCZ.
I have a post war repainted gray TCZ with the two 115vdc dynamotor power supplies for shipboard use. One for the HV the other for the 28vdc
There is a 115vac electronic power supply that oddly, to me at least, uses a motor driven 28vdc supply for the motor auto tune.
Another minor difference is the remote used, it also incorporates a built in speaker and the same controls as the remote  for the ART-13

I've yet to get mine restored and operational. If you goes to Nick's excellent Navy Radio site you can see pics of the TCZ's and the two different power supplies used.

Paul
N6FEG