Black-rumped Flameback
Dinopium benghalense
The black-rumped flameback is a large species at 26–29 cm in length. It has a typical woodpecker shape, and the golden yellow wing coverts are distinctive. The rump is black and not red as in the greater flameback. The underparts are white with dark chevron markings. The black throat finely marked with white immediately separates it from other golden backed woodpeckers in the Indian region. The head is whitish with a black nape and throat, and there is a greyish eye patch. Unlike the greater flameback it has no dark moustachial stripes. The adult male has a red crown and crest.
ID text from Wikipedia, CC BY-SA 4.0

Common Flameback
Dinopium javanense
Males and females differ in the crest colour, as males have a bright red crest while females have a black crest with white streaks. Both sexes have a white supercilium, white cheek stripe, and white throat area, all separated by stripes of black, and they have a spotted black and white underside. The bird is distinguishable from other similar golden-backed woodpeckers, such as the greater flameback (Chrysocolaptes guttacristatus), by its smaller bill and black nape, and from the black-rumped flameback by its red rump and white throat. Voice: The common flameback is a relatively quiet species, who rarely produces noise despite being able to produce many different sounds. Although it belongs to the woodpecker family, it surprisingly rarely drums on wood, as it has a different foraging behaviour.
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: Black-rumped Flameback and Common Flameback.