cc-by-sa us legal code, 4. b. {l Wrote}:You may distribute, publicly display, publicly perform, or publicly digitally perform a Derivative Work only under: (i) the terms of this License; (ii) a later version of this License with the same License Elements as this License; (iii) either the Creative Commons (Unported) license or a Creative Commons jurisdiction license (either this or a later license version) that contains the same License Elements as this License (e.g. Attribution-ShareAlike 3.0 (Unported)); (iv) a Creative Commons Compatible License.
Looks like (iii) would allow it.