Yeah, based on running the numbers... these minor changes in MF are negligible. We're talking like ~$2/mo with all other numbers staying the same on a $53k MSRP car. For comparison, adding a $1000 incentive takes about $30/mo off of my est. payment.
Edit: Didn't notice the two different residual amounts between March/May. You'll need to run the numbers to get a true comparison since residual changes also have a big impact on monthly payment.