dat moshe, etc

for a while i;ve speculated that there is a connection between the "dat moshe ve-yisrael" by which we marry and the "dat moshe vi-yehudit" of mishnah ketubot 7:6.
Yesterday, i read a ketubah of a woman from the dead-sea region in mishnaic times (a wealthy society lady, not a sectarian) where the translation read "according to the laws of moses and the judeans." I'm not sure what the original read, but I thought reinforcedd the yisrael/yehudit connection by providing an alternative that is sort of like each: yehudim.
anyhow, i have no idea what to make of this, or where to find out.
thoughts are appreciated.
M
ps - in my attempts to find the mishnah citation above without actually opening a mishnah (ie, via google), i came across a seemingly article, moderatly related... didn't read it, though, because my first final is in two weeks...