During one scene in The Howling, two nuns enter a bookstore. Not just any bookstore mind, this bookstore just so happens to belong to a man named Walter Paisley, and aside from books, Walter has a thing for collecting occult items.
Seemingly the centerpiece of Walter’s collection of cursed objects is the mummified corpse of Grandma Sawyer from The Texas Chainsaw Massacre. Nobody in the film actually refers to this by corpse by its name, or even draws attention to the fact that it may or may not have come from Texas, but it’s absolutely the same corpse from that film.
In reality, the reason why the corpse is used in the film is that both films shared the same art director, Robert A. Burns. Burns has gone on record stating that he re-used several props from Texas Chainsaw Massacre during the shoot for The Howling.