It has been a while sense I looked over the Colts and they may have changed but at one time they used different sized trigger pins and the upper and lower pins where also a different size (larger). This is not a problem unless you decide to swap out parts later down the road. As long as you know this up front you should have no problems with the firearm.
Have a good one!
Plan for the worst, Hope for the best and if you land on your feet running life is good!!!