Fraxel dual - can use both 1927 and 1550 on same area in same tx session ?

Had fraxel restore (1550nm) done today settings were 30/4 with what it seemed like 2 passes over most areas although the machine setting said 8 prior to the treatment starting. I initially came in to have both 1550 and 1927 (dual) but she said this wasnt possible that only one laser could be used per area so for example 1927 on the forehead and 1550 on the cheeks. Is this correct? If both are done in same area should settings be lowered slightly for both? Thanks!