There is no height difference. A softball mound is not raised like a baseball mound.
In MLB, the pitching rubber is at a height of 10 inches.
The height of the mound and the size of the pitching rubber could vary from one level of baseball to the next, but within each level, they will be the same.
The top of the rubber is to be no higher than ten inches (25.4 cm) above home plate. From 1903 through 1968, this height limit was set at 15 inches, but was often slightly higher, sometimes as high as 20 inches (50.8 cm), especially for teams that emphasized pitching. The lowering of the mound in 1969 was intended to "increase the batting" once again, as pitching had become increasingly dominant, reaching its peak the prior year; 1968 is known among baseball historians as "The Year of the Pitcher". This restrictive rule apparently did its job, contributing to the hitting surge of modern baseball.
Pitchers mound
No
to legally play only one person can be on the pitchers mound while the game is in play
The diameter of an MLB pitcher's mound is 18 feet.
YES
Measure from the front edge of the pitching rubber to the back tip of home plate.
By regulation, the peak of the mound should rise 10 1/2 inches above home plate.
Pitchers can do their initial warm-ups anywhere, usually some light throwing to warm up their arms in the outfield area. Then they can move into the bullpen where there is a mound and a catcher where the height of the mound and distance to the catcher are identical to the mound and catcher on the playing field. Starting pitchers may use the bullpen for their warm-ups during pre-game ceremonies on the field, then move onto the mound on the field immediately prior to the start of the game, and relief pitchers will use the bullpen prior to going into the game.