I checked and in DAK they are 157 feet high, 30 feet shorter than Cinderella's Castle, but I was wrong about them being close to DL's Space Mountain (76 feet). However, I can easily imagine them making a DL version a bit smaller in scale, so they could be shorter than (and not compete with) the Matterhorn's 147 feet.
Note, that's 157 from the "top" which is actually one of the little rocks floating away. The bulk of it is in the middle third of the height.
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Also note, for DL, they could create a much tighter ravine or tunnel that you must travel through and then you appear in a tight valley beneath the rocks (Mario World-style). So, you'd lose out on these big DAK vista shots, but magical nooks and crannies are in keeping with Disneyland's charm (see Indiana Jones Adventure).