As The Living Nach often mentions in the footnotes, variations in Biblical spelling of names is not unusual.
The most famous case is probabaly Eliyahu, as in Eliyahu Hanavi. Eliyahu is sometimes referred to as Eliya. In this case, the commentators match it one-to-one with Yaakov being written with an extra Vav, as if he's taking Eliyahu's Vav as collateral until he redeems us from Galut.
But mostly the difference is ignored, or pointed out, but not elaborated on.
Even calling people by various names is not unusual. Check Rashi in the various times the Yidden are counted in Chumash.