The Helix units are like the XX9 models and don't have a threaded Ethernet port like your units do.
Ethernet is part of the cable collector for quick disconnect.
The power cord is the same.
Yes the transducers are different, the G2N SI units are MEGA units with the extra Imaging frequency and a Down Imaging crystal in the SI transducer.
You would need an AS EC QDE Ethernet adapter for each unit to connect the Ethernet cable to them.
If you have the original 5 port Ethernet switch AS ETH 5PS, you would have to get the current one AS ETH 5PXG.
Edited by Wayne P. (12/30/17 12:22 PM)
Humminbird Helix 12 CHIRP SI, 1198c SI, 1198c SI, ONIX 10 SI NT, Helix 7 CHIRP SI GPS G2, SOLIX 12 SI, 360, RC-1