I'm not a mathematician, but my rear-end dynamometer tells me that the Disneyland version drops a lot more than the WDW version. Then there's the second drop that is shorter, but still has more of a kick than WDW's lone drop. I assume it's the steeper 21 degree angle.
One of the things I love most about visiting the various Disney parks around the world is comparing/contrasting the differences. Make sure you hit all the Disneyland-exclusive rides, but also try going on the cloned rides that have noticeable differences, like Haunted Mansion, Small World, Jungle Cruise, Space Mountain, Tower of Terror, and most especially Pirates.
Interestingly, Tokyo Disneyland has a Pirates that's almost a direct clone of the Anaheim version, right down to the Blue Bayou restaurant inside. But due to the high water table of the Tokyo site, they had to go the WDW route and they have just one very gentle slide as their lone "drop".