While the LT3960 uses the CAN physical layer to conduct bidirectional I2C data, the CANSCL and CANSDA buses created by the LT3960 are not traditional CAN buses carrying traditional CAN data.
As such, the CANSCL and CANSDA buses between LT3960 devices cannot be shared with standard CAN transceivers in a multidrop configuration. There can only be other slave LT3960 transceivers connected to the CANSCL and CANSDA buses.