different between whydunit vs howdunit

English

whydunit (plural whydunits)

A type of detective story in which the focus is not on who committed the crime, but what were their motives for committing it.

howdunit (plural howdunits)

A type of detective story in which the focus is not on who committed the crime, but how they have done so.
- 1969, Ellery Queen: In the Queens' Parlor, and Other Leaves from the Editors' Notebook, p 72 [1]:
  After half a century, the whodunit was joined by the howdunit, in which the emphasis swung from the identity of the murderer to the method by which the murder was committed.

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