Changing to normal formula after being on comfort formula at 9months old

Hi. My lo is 9 months old now she has been on Aptimal comfort since she was 6 weeks old, due to constipation/mild colic. They symptoms have long gone have never thought before now of changing back as she has done so well on it. Now at 9 months old she is on 3 meals a day and about 14-20oz of formula over 2-3 bottles. Im wondering whether to change back to Aptimal first milk (bit cheaper and cartons for out and about) at 9 months could we end up back where we started with constipation or wont it make much difference now she on varied diet anyway. Any help or advice would be appreciated. Thanks. X