Eurasian Magpie
Pica pica
The adult male of the nominate subspecies, P. p. pica, is 44–46 cm (17–18 in) in length, more than half of which is the tail. Its wingspan is 52–62 cm (20–24 in). The head, neck, breast and vent are glossy black with a metallic green and violet sheen; the belly and scapulars (shoulder feathers) are pure white; the wings are black glossed with green or purple, and the primaries have white inner webs, conspicuous when the wing is open. The graduated tail is black, glossed with green and reddish purple. The legs and bill are black; the iris is dark brown.
ID text from Wikipedia, CC BY-SA 4.0
Oriental Magpie
Pica serica
It is 45 cm long. Compared to the Eurasian magpie, it is slightly smaller, with a proportionally shorter tail and longer bill and tarsi (lower legs), and darker with less white in the plumage. The back, tail, and particularly the remiges show (according to source) either bluer, less green iridescence compared to Eurasian magpie, or conversely, more green. The rump plumage is mostly black, with narrow, often greyish-white band, which connects the white shoulder patches as in its relatives. The Oriental magpie has the same call as the Eurasian magpie, though somewhat softer.
ID text from Wikipedia, CC BY-SA 4.0
Where you might meet both
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Play BeakBrainPhotos and recordings are credited to their authors under the licence shown. Full profiles: Eurasian Magpie and Oriental Magpie.