Yark vs Yarke - What's the difference?

As a verb yark

is to make ready; prepare or yark can be to draw (stitches etc) tight.

the saki, pithecia leucocephala .

From (etyl) . More at (l).

(en verb)

To make ready; prepare.

*1881 , Walter Gregor, Notes on the Folk-Lore of the North-East of Scotland :

[...] Yet thou hast given us leather to yark , and leather to bark, [...]

(obsolete) To dispose; be set in order for; be destined or intended for.

(obsolete) To set open; open.

* (l)

Origin uncertain, probably originally imitative; compare (jerk) etc.

* yerk

(en verb)

To draw (stitches etc.) tight.

To hit, strike, especially with a cane or whip.

To crack (a whip).

*, Folio Society, 2006, vol.1, p.96:

*:he would throw a Dagger, and make a whip to yarke and lash [tr. faisoit craqueter''], as cunningly as any Carter in ''France .