question

No It is not. RS485 is a bipolar signal - reduced voltage compared to RS232. CAN is unipolar - both signal voltages are between 0 and 5V. It is also bi directional where as 485 has separate lines for Tx and Rx. some converters are available.

There are two types of RS485 physical layers, half-duplex (2-Wire) and full-duplex(4-Wire). The Half-duplex RS485 is simmilar to CAN- Bus (ISO-High). The first CAN Interfaces for personal computers worked with RS485 transceivers for baudrates up to 250 kbps. Beside the higher baudrates there are differences in voltage stability and shortcut protection. CAN-Bus transceivers can handle shortcuts between vehicle supply, ground and comunication lines with a voltage up to 50V and support baudrates up to 8Mbps (CAN-FD)