NR-N2, if your NR is lower than normal then you have a low side and the affected engine is the one with the least torque. There may or may not be a N2 split depending on the power in use, the severity of the malfunction and the ability of the good engine to maintain NR or alternately droop.
If your NR is higher then you have a high side and the affected engine is the one with the high torque. The good engine N2 should be in the normal range.
It’s quite easy to spot once you know what your looking for.