The RX on UNO is blinking and both CAN measures 20µs.
I try another value (200kbps) instead and both CAN measures 5µs.
So the MCP and UNO modules are ok?
At pin4 of the transceiver (from your image on message #17), I have CAN signal. The same at Pin2 of the MCP2515.
Now your image makes sense to me. Both values are the same.