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PXI CAN Board enumeration consistency

I have a PXI chassis with three dual-port CAN cards.
 
Why do they enumerate as different channels with different power ups (CAN0 - CAN5)?
The top channel is always even, the bottom is always odd, but left to right they change.
Sometimes the left slot is 0,1; sometimes 4,5; occasionally 2,3.
 
Is there any way to guarantee that they always enumerate the same?
 
 
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