This is only ONE K-LINE and one L-LINE. The k-line is Bidirectional used for Test tool communication, the L-LINE is sometimes used to initiate Diagnostics so it's only used to send the INIT no bi-direction comms happen on this wire.
The maker of Mongoose is DrewTech. I'm not sure the specifics on the rest. One of DrewTech's employees frequently posts on this site so he should be able to answer your other questions. Or you could call them..