MCP2561/2562 CANbus voltage?
I believe the suitability for 12/24V systems refers to the high DC voltage tolerance on the CAN lines, it is +/-58V absolute maximum for this part, meaning it will survive missing signal grounds better, when different CAN nodes get different voltage potentials. There's still plenty of quacks in the 24V market who design CAN systems without a signal ground.

But the part also has high ESD immunity, 14kV contact discharge, and automotive circuit stress test qualification etc.