How to map UNSPSC Code to multiple Categories

My user has Procurement set up for US and Canada.  They wanted separate Categories for each Org (US / Canada).  We have Punchouts for US.  Now looking to add punchouts for Canada.  Business was looking to map same UNSPSC code that is mapped to a US Category to a Canada Category as well.  The system does not allow this.

An example 14101501 mapped to Office Supplies. (US) and Office Supplies-CAN. (CAN) ---this is not allowed.

I told the business that the vendor will have to map to unique codes so we can map them to Canada Categories.  Is that the right approach?  Is that the usual method of doing this?  Any suggestions?