When an order is modified, what happens to the rules of the original final decree, when the modifaction is just a custodial parent move.?

In Iowa, when a final decree has been entered in a custody fight, as well as an affirm deciesion by the Iowa Supreme Court, when that order is slightly modified because the custodial parent moved out of state, which in turn gave the non custodial parent more visatation, does the rules of the final decree change? Meaning that if the original order, upheld by the supreme court states that the NCP must let the custodial parent know by April 1st which weeks in the summer he will be taking, and the new modifacation states nothing about it, but also didnt change anything else in the modified version, does the April 1st deadline still count or is the entire 3 year trial and supreme court ruling meaningless due to a minor move?