@Seeed_Harrison gave the only informed answer and all others didn’t even understand the intent of the orginal posted question.
Summary about the Seeed Xiao CAN bus expansion board: this can only handle high-speed CAN. The used PHY (SN65HVD230) is limited to that only which can be verified easily by reading the introduction of the datasheet that states “compatible with ISO 11898-2 standard”.
In case you want support for low-speed CAN of ISO 11898-3 signals you need to explicitly search for PHYs that support it (e.g. TJA1055 by NXP). There may be some available that support both low- and high-speed of ISO 11898-3, but I haven’t seen any so far.