Yes it's ground finer, smaller particles break down faster into soluble salts, though whether that is necessary or even an overdose depends on how much you applied and soil pH.
Generally speaking the dry/coarser is cheaper to use and you just use more of it for the same nutrient maintenance at that level for longer since it does break down slower.
If you break it down with acid before application you'd want a complete reaction to the point where the resulting pH is close to neutral so no pH effect on soil fungus or bacteria, but then you'd have swings between too much at time of application and too little right before the next application unless you're a maniac about it and mix a tiny bit into the water on a regular basis, which is a lot of work compared to just using dry as directed once and being done.