Does Transmission connector = Engine connector ?

I have an engine diagnostic connector back in the engine compartment of my 04 HR Neptune. There is also a large round connector under the dash, but it is marked Transmission. Are these connectors both usable for the Junction box ? Obviously the one in the dash should be easier to use connecting to the computer. My opinion is that if it is a communication bus, both the engine and transmission information should be available on both connectors, but admittedly, I am new to all of this.

Thanks in advance

Jim Morton

Yes.

Your opinion is well justified. However, to be sure, count the number of pins actually used in the connector. In the six-pin version, four should be in use. In the nine-pin version, seven pins should be in use.