Yes. None of the various MATLAB licenses are operating system specific.
If you started running under Bootcamp sufficiently long ago, you might need to deactivate and activate a new license file, as sufficiently old MATLAB for Windows could activate by the disk serial number. But otherwise it should recognize that it is the same machine because it would have the same ethernet adapter hardware address.
Exception: if you happen to be running a thunderbolt based display, there is a risk that it might take the MAC address from there under OS-X but would not have done so under Windows. So you might need to deactivate and reactivate anyhow.
