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For all practical purposes, there is no difference connecting to IN- versus connecting to IN+.
Connecting to IN- excludes the shunt voltage from the Bus voltage measurements, and the resulting Bus voltage is the actual voltage dropped across the load. As a result measured power is closer to the power actually delivered to the load.
Given that shunt voltage is much smaller than Bus voltage in most applications, connecting to IN- or IN+ makes little difference.
There are other minor differences of even less importance, they can be ignored. You have the freedom to connect to either.
