Answer: In 1939 a series of mounds at Sutton Hoo in England revealed their astounding contents: the remains of an Anglo-Saxon funerary ship and a huge cache of seventh-century royal treasure. In southern England near the Suffolk coast lies a stretch of sandy heathland dotted by mysterious mounds of earth.
Well both etching and drawing show a whole picture, use ink, and both are considered sketches.
These are just some simple similarities. Hope this helps.