Unfortunately, no. Contempt of Congress is not the same as contempt of court. I'm waiting to see how far Congress is willing to push this confrontation. I'd like nothing more than to see congress subpoena Judge Greer and for a U.S. Marshal show up at his house, place him under arrest, and escort him to Capitol Hill. That's one media event I would watch.
My recollection is that contempt of Congress consists in failing to show up, or failing to answer questions without asserting a valid privilege, or failing to produce documents or things. If Congress can order the production of a person or a thing, it would be logical to assume that they can order that the person be kept alive and that the thing be preserved. Wouldn't removal of a feeding tube from a person who is the subject of a valid congressional subpoena constitute an effort to destroy evidence and thus constitute contempt of Congress? Or have you some knowledge of the statute that provides otherwise?