This is the same foot exactly 1 month apart.
Take a really good look.
The sole picture on the left is the foot in very dry hot weather, then the weather changed, things cooled off and we had a few weeks of rain and the sole transformed itself to be the foot in the sole picture on the right.
Before June trim, before July trim 2018.
The sole searches for the ground, so when a horse is living on a hard surface the sole will have less concavity.