I did a trigger shot on Monday October 5th to make me ovulate, went in at 12 noon Tuesday the 6th to do IUI and we did an u/s first and egg hadn't released yet. Because it hadn't released we did back to back IUI's so I had a 2nd IUI on Wednesday morning about 10am. They told me to BD the next couple of days to be safe also. I know that isn't really an answer but basically it should be close but hard to tell exactly when you O.
dpiui = days past iui and dpo = days past ovulation
It's usually about the same, since the REs tend to time the IUI so that it's right before ovulation.