Hi,
On the 3.6 there's also 34 and 33 labelled CAN1.
CAN0 on 3+4, and 29+30 just means they're multiplexed to the same bus, you can use either set of pins for that CAN bus, if the process is anything like i2c you may have to tell the teensy which pins to use, but it's likely to default to pins 3 and 4.