The adult Syrian Woodpecker is very similar to the adult Great Spotted Woodpecker.
However, with the Syrian Woodpecker the black mustache stripe does not reach the back of the neck and the back of the head, making the side of its head much whiter.
The Syrian Woodpecker also has a light pink underbelly (not as red as in the Great Spotted Woodpecker) and often stripes on the side of the chest and belly and a slightly longer beak.
In addition, the Syrian Woodpecker has little white in the tail whereas the Great Spotted Woodpecker has a lot.
Juveniles differ from the juvenile Great Spotted Woodpecker by the red breast band and the always striped flanks, like in the Middle Spotted Woodpecker and the White-backed Woodpecker.

Hayarkon Park, Tel Aviv, Israel, 29 December 2019