different between graphical vs pictoral

English

graphic +? -al

graphical (not comparable)

Of, related to, or shown on a graph.
(computing) Of, related to, or using graphics.
Written or engraved; formed of letters or lines.
- 1643, Thomas Browne, Religio Medici
  The finger of God hath left an inscription upon all his works, not graphical, or composed of letters.

Probably an alteration of pictorial influenced by analysis as Latin pictor (“painter”) (the source of pictorial) + the common suffix -al.

pictoral

(uncommon, possibly nonstandard) Alternative form of pictorial.
- 1998, Dictionary of the Theatre: Terms, Concepts, and Analysis ?ISBN, page 215:
  mise en abyme […] is a device in which an enclave is embedded in the work (which may be pictoral, literary or theatrical), […]

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