What best distinguishes khayālī from wahmī?

Classification of Simile by Its Two Terms: Sensory, Intellectual, Imagined, and Supposed

• Both require external existence
• Khayālī is only sound and wahmī only colour
• Imagination is absent from khayālī
• Khayālī recombines sensible parts; wahmī attributes a sensible-like feature to a supposed entity