Our Fuzion 420 has 2 Grey and 2 Black. Our washer is in the back garage area and it drains to the rear Black. I know this because the 2nd half bath toilet seldom gets used and the Black 2 fills....also the Black 2 water drain will be clean and soapy looking.
I know a few TH by other companies we looked at had Washers in the front bedroom, so I guess those would drain to front Black.
A trick you could do.....fill a bucket with a couple gallons of water. Make sure the tanks are fully drained. Pour into the drain of choice. Start pulling levers for drains one at a time....
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