Does it make a difference if I have a bow equipped when I use my blasters in might and magic 6?

As far as I know, the blasters fire raw energy blasts that does not benefit from elemental damages on bows. Just as melee weapons only benefit from the extra damage on said weapon.

Your blaster's attacks ignore the properties of your bow. If your bow has an enchantment like "of the Gods" (+10 all stats), you'll still benefit from that, but I don't think that tracking down stat-boosting bows is worth the time or attention of a blaster-wielding party.