This is where things get misunderstood.
There are definitely rules that differ from USSSA to CUSSSA - but the Strike Zone is not one of them.
-Pitcher must toe the rubber (CUSSSA rule)
-Pitcher must pause and present the ball
-Pitcher must deliver in an underhanded motion
-Ball must travel 3' up from release and may travel as high as 10' from the ground.
-Ball must be DROPPING through the batter's strike zone (not zooming thru - remember, this is slowpitch)
That is not word for word from The Book, but a quick layman's term run thru...
By rule, the strike zone at a CUSSSA event is the exact same as a USSSA D Mixed event.