Chestnut Munia
Lonchura atricapilla
Small, sexes alike, races differ slightly in intensity of colour. In L. a. jagori, the adult has the whole head, breast, centre of belly, and undertail coverts black; the back, wing, and sides of belly chestnut, brighter on underparts, duller on wings; uppertail coverts dark reddish brown, underpart buff; uppertail coverts and tail as adult. Bill silvery grey; eye chestnut; legs gray.
ID text from Wikipedia, CC BY-SA 4.0
White-rumped Munia
Lonchura striata
The white-rumped munia is approximately 10 to 11cm in length, with a stubby grey bill and a long black pointed tail. The adults are brown above and on the breast, and lighter below; the rump is white. There is some variation between the subspecies, but the sexes are almost impossible to distinguish in all subspecies; males have a more bulky head and bill.
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: Chestnut Munia and White-rumped Munia.