Thorp - sorry for the ******* start to my earlier reply. Just bad timing all the way 'round.
All mounds are a little different, and in fact they're a big part of a home field advantage, I think. You can have a nice big, smooth curve from the top of the bump (which is not in the center of the circle, but a foot and a half behind the center), or a sudden drop, or almost flat through the pitcher's stride - the bump can be high or low, the dirt in front can be hard as a rock or nice and soft (or soft where your pitcher's stride ends and hard where the opposing pitcher's hits, or vice-versa), the rubber can be higher on one end than on the other (not supposed to be, but... ). All that ****.
The max height of the bump was lowered a half foot back in the 60's, presumably to take away some edge from pitching and get more offense into the game. You can understand that your home field groundskeepers will be (at least, could be) building the mound to suit your team - and if possible to hurt opponents. BTW, something else you can do to eff up your opponents just a little bit is to manicure the mounds in the Visitors' bullpen - make 'em opposite the field mound, too high, too low, etc.
In the case of the 'Blatt versus the Latte Grande (or whatever its name is, this year), and why the mounds differ... frankly, I dunno (does UT Omaha play there?) - if it's lower, they're probably trying to spice up the offensive output in this dead-bat year; if it's higher, they're probably trying to get some pitching duels going. I gotta confess, I wasn't listening to the games, for the most part, just had the vid on and catching a few plays here and there, so I didn't hear them talking about it... finally, of course, it mighta notta gotta lotta do with intent, but accident - new grounds crew, maybe.