The great difference is in the attitude towards the Lord's Supper, the Reformed or Calvinistic Churches repudiating not only transubstantiation but also the Lutheran consubstantiation.
SACRAMENTARIANS, the name given to those who during the Reformation controversies not only denied the Roman Catholic "transubstantiation," but also the Lutheran "consubstantiation."
The most interesting example of this method is seen in the Tractatus de sacramento altaris where Occam accepts the doctrine of Real Presence as a matter of Faith, and sets forth a rational theory of the Eucharist (afterwards adopted by Luther) known as " Consubstantiation."
But Luther elsewhere professed Consubstantiation; that is, in modern Lutheran phraseology, the " presence of our Lord's Body " in, with and under the bread.
He had abandoned Luther's doctrine of consubstantiation and adopted the doctrine of a Real Presence conditioned by the faith of the recipient.