Ford is a Progressive Conservative whose party differs from that of Carney, a Liberal, but the two underscore broad political unity in Canada over the trade fight with Trump.
Maybe further helpful context is that Carney is federal and Ford is provincial and the provincial political parties are distinct from the federal parties (for Liberals and PCs) Going to borrow wikipedia here:
Seven provinces and one territory in Canada have a "Liberal Party" in their legislatures. Neither Nunavut nor the Northwest Territories have party-based electoral and governing systems (both operate with consensus democracy). British Columbia had a Liberal Party whose name and ideology have shifted, BC United;[150] Saskatchewan also had a Liberal Party whose name has changed, Saskatchewan Progress Party.[151] Yukon, Alberta, Manitoba, Ontario and Quebec each have a Liberal Party that may align ideologically with the federal party but operates as a completely separate entity (though at one time were affiliated): Those provincial parties have separate policies, finances, memberships, constituency associations, executives, conventions and offices.[152][153][154] The New Brunswick, Newfoundland and Labrador, Nova Scotia, and Prince Edward Island provincial Liberals are each semi-affiliated with the federal Liberal Party.[155][156][157]
And here:
The Conservative Party does not have any provincial wings. However, it often works closely with the former federal Progressive Conservative Party's provincial affiliates as well as other small "c" conservative and centre-right provincial parties, such as the Saskatchewan Party.
So it's not nearly as remarkable as it might sound in the context of US politics.
That said, if you told me in 2010 that Ford (who was running the US branches of his family business at the time) would be picking fights with the US government, I would not have believed you.