Yes it's a differential pair, but you have to have 2 connections on the board for the same differential pair. I worded that really confusingly. You need a "into the board" can1H and can1L and an "out of the board" can1h and can1L since they are daisy chained together.
Well, I guess you could have a cable that juts out a "canh & canL" every now and then, but they don't usually make cables like that.
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