CAN bus is a general agreement of the car, K and LIN are the same, but different models are used differently, such as trucks, cars use CAN, motorcycles use K.
The hardwire signal is directly connected to the PIN of the chip and transmits high and low levels.
Hardware signals are generally used for basic control functions such as KL15 (ignition control).
The CAN signal transmits data, consisting of the 0s and 1s of a stream of bits (bits).
CAN signal can carry a large amount of data, so it is generally used for automobile intelligent control.
When it comes to the appearance of the line, I am not very clear, and each car manufacturer uses different products