The same inverter, why the same load, the current will be different? Which part of the inverter reflects the power of the inverter?

The same two frequency converters. The same load, the current must be the same (almost the same), the same inverter, the same load, the current will of course be different, mainly in whether the load is the same.

Of course, the power of the inverter is reflected in the rated current. (For the same type of inverter, the rated current of single-phase and three-phase is different due to the influence of input voltage. )

It is possible that the current carrying efficiency is low and the internal resistance is large after replacing the rectifier inverter device. Will cause a large current. But this probability is extremely small.