I bought these for the first time last week, so I don't know what the old formula tasted like.
These are comporable to the NutriGrain Apple Cinnamon bars, but not an exact match. The filling tastes the same, but the outside crust is the big difference. The crust is a bit more firm and dry, but less crumbly bits on top. The crust seems to be thicker also.
I actually like these MP brand a bit better than NutriGrain brand because they don't fall apart or break as easily. I would often find a NutriGrain bar that had gotten bent or smushed in the bottom of my bag, but these MP brand bars don't seem to do that.