Get em both rewired 16 and use a y cable out of the 8.
The B cab is already 16ohms and the A cab has a 16ohms input as well... Maybe that's the simplest answer...
If A cab has 16ohm input as well then there's no issue! Two 16s from the 8 ohm output is fine
@deleted started
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Get em both rewired 16 and use a y cable out of the 8.