One cable has 14-pin plugs on both ends. That is to connect to the MEGA 360 14-pin plug and the other to connect to a SOLIX= 14-pin transducer extension cable. That is a standard accessory cable listed on the Humminbird website. There is a 30' version also.
Mine has 490422-3D 3019 in the tag.
The other one has a 14-pin plug on one end to connect to the MEGA 360 and on the other end is a 7-pin plug to connect to a Helix= 14-pin to 7-pin converter cable. 490537-1 with bar code 190731870010 on the tag.