Greater Flameback
Chrysocolaptes guttacristatus
The greater flameback is a large woodpecker, at 33 cm in length. It is of typical woodpecker shape, and has an erect crest and a long neck. Coloration is highly variable between subspecies; it always has unmarked golden-yellow to dark brown back and wings. The rump is red and the tail is black. The underparts are white with dark markings (chevrons, stripes, or bands), or light brown. The head is whitish with a black pattern, or it is yellow, brown, or red.
ID text from Wikipedia, CC BY-SA 4.0

White-naped Woodpecker
Chrysocolaptes festivus
The white-naped woodpecker is a large species at 29 cm (11 in) in length. It is a typical woodpecker shape. The white hind neck extends down the back, and the black shoulder patches also continue onto the back to form a V-shape bordering the white. The rest of the upperparts and wings are golden yellow. The rump and tail are black, and the underparts are white with dark chevron markings. The head is whitish with a dark moustache stripe and a black eye patch that extends down the neck sides. The adult male white-naped woodpecker has a red crown and females have a yellow crown.
ID text from Wikipedia, CC BY-SA 4.0
Where you might meet both
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Play today's Daily BirdPhotos and recordings are credited to their authors under the licence shown. Full profiles: Greater Flameback and White-naped Woodpecker.