So Shattered was "give me two different documents with the same sha1, I don't care what they are". I guess according to Wikipedia that's a "classical" collision

So Shattered was "give me two different documents with the same sha1, I don't care what they are". I guess according to Wikipedia that's a "classical" collision. Then there's "here's two different documents. Append to both of them until the results have the same hash". This is "chosen prefix" collision. My question is, is there a name for an attack that says "here's a document. give me another document with the same hash."? (in which case, "the original" would have meaning).