In theory you can BUT it depends on a couple things, not to mention there are risk involved and you must have a knowledge of taxidermy.
Couple things to consider. Are the ears bondo or earliners? Are the earbutts sculpted from clay, epoxie or casted? Is the skin tanned or dry preserved?
I'm going to guess and say they are bondo ears and clay butts. If so, you could carefully rehydrate the earbutts and reshape/position. That's if the skin is tanned. If it's dry preserved I personally wouldn't touch it.
Like Mike said, a complete remount would be the only sure fire way. During the rehydration process you could mess up the eye work and/or cause other problems. It can be done without doing a remount but too many variables come to play to determine the "how".
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