same or 1/8" probably not an issue. although I don't know much about fords. However, on many GM vehicles there is very little clearance between the rubber bump stop on the front when at normal ride height. so you really want to watch the front squat and get it close to or slightly above unloaded ride height. more than about 1/4" of sag and your close to the bump stop which affects ride.
I know that some mfg recomend not going back to unloaded ride height but split the difference. that what GM not recomends. However, I have found the ride ad handling is better if I bring it back to unloaded ride height rather than splitting the difference.