Let say a baseball represents a 10% chance to hit. When you attack any enemy with that baseball. It doesn't all of a sudden change into an orange. It's still a baseball no matter what.
The game may take and change the size of that baseball and how it impacts even change the color, but it cannot change what it is which is a baseball. So the fact is the set thing you threw is a baseball.
So if you have a 10% chance to hit an enemy when attacking, then no matter what the number says on screen you're still delivering a 10% chance to hit no matter what. The game doesn't change the 10% it only adjusts it accordingly just like the game cannot change WHAT was thrown.