You can have a look to its book, a part is dedicated to brain processes in sign language, you can maybe find your answer there --> Emmorey K. 2002. Language, cognition, and the brain: Insights from sign language research.
To my knowledge, if by "vocalizations" you mean sentences, yes there is a common left asymmetrie of PT areas for both languages.
Campbell, Ruth, Mairéad MacSweeney, and Dafydd Waters. "Sign language and the brain: a review." The Journal of Deaf Studies and Deaf Education 13, no. 1 (2008): 3-20.
https://www.livescience.com/10628-brain-spots-handle-sign-language-speaking.html
Potentially of interest: http://www.helsinki.fi/varieng/journal/volumes/03/campbell/
MacSweeney, Mairéad, Ruth Campbell, Bencie Woll, Vincent Giampietro, Anthony S. David, Philip K. McGuire, Gemma A. Calvert & Michael J. Brammer. 2004. "Dissociating linguistic and nonlinguistic gestural communication in the brain". NeuroImage 22(4): 1605-1618. doi:10.1016/j.neuroimage.2004.03.015
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