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Do you have an inspection point where you can see the drain line(s) enter the septic tank?
If so, I would just put some stuff down the line that would let you know which line is which. Ex. sudsy water. Or some cheerios or fruit loops (they'll float for a while and will decompose readily)

Things that float will be blocked by a partition in the septic tank that prevents things like grease from getting out to the septic field - so if you can't see the drain line entrance you may not see anything that floats. And in that case you probably have to go with one of the other suggestions.
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