One Mixto laser vs series of Clear + Brilliant or Fraxel duo for long-standing PIH?

Can a series of clear and brilliant or fraxel dual give you the results of 1 ablative fractional laser done at more conservative settings for darker Fitzpatrick type IV skin tones? I would like to treat longstanding PIH from acne, and at home chemical peels. I have been told my shallow rolling acne scars need an ablative fractional laser and other derms say my scars are not severe enough to require the ablative laser.