Olive skin - Pearl vs CO2 - is there really that much of a difference?

I have had the Pearl fractional laser done more than 2 times with beautiful results and no issues. The tightening was impressive as well as the diminished lines. I have moved from the area where lasers were abundant, to an area that has limited lasers I found a place that uses CO2 fractional laser, however, the team seems reluctant to treat me reasoning that I have olive skin. Is there really that much of a difference between Pearl and CO2 that I should be concerned?