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

Himalayan Flameback
Dinopium shorii
The Himalayan flameback is very similar in appearance to the Greater Goldenback (Chrysocolaptes lucidus) but they are not at all closely related. The primary differences are its smaller size and bill. The Himalayan flameback can be identified by its black hind neck, and the brownish center on its throat, which can go down the breast on some and is bordered by an irregular black spotting. They also have an indistinct divided moustachial stripe, the center of which is brownish, and sometimes reddish in males. The Himalayan flameback also has either reddish or brown eyes and three toes. Voice: The Himalayan flameback call is a series of rapidly repeated klak-klak-klak-klak-klak. The call is slower and softer than that of the Greater Goldenback.
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 Himalayan Flameback.