I think I'm familiar with Consubstantiation. It is the belief that
the fundamental "substance" of the body and blood of Christ are present alongside the substance of the bread and wine, which remain present.
Impanation is a new one for me. I learned it earlier today when reading about John Huss, where it was ascribed to John Wycliffe (oddly, Wikipedia on Wycliffe has no mention of Impanation. Apparently, according to Wikipedia, Impanation is the belief of the
the real presence of the body of Jesus Christ in the consecrated bread of the Eucharist that does not imply a change in the substance of either the bread or the body ... This view is similar but not identical to the theory of consubstantiation.
It seems that both descriptions say the same thing. The substance of Christ is present in the bread, but the substance of neither is changed. The only hint I have that they are different is the Impanation definition used "real presence" which is a distinctly Catholic term, and then further insists they are different without explanation.
How are they different? And since I'm unfamiliar with Impanation, what Christian groups are said to believe it?