Brown Accentor
Prunella fulvescens
They can be identified by their white supercilium (broader behind the eye), blackish-brown mask, blackish-brown ear-coverts, yellowish breast, and yellowish belly. Males are larger than females.
ID text from Wikipedia, CC BY-SA 4.0

Robin Accentor
Prunella rubeculoides
The robin accentor is a large accentor, growing to a length of about 17 cm (7 in). The sexes are similar in appearance and have the slender, sharply-pointed beak typical of an insect-eating bird. The head and neck are grey while the other upper parts are brown, streaked with black. The throat is a uniform shade of reddish-orange and the belly pale buff. The wing coverts have white tips. The call is a high trill, or a repeated "tszi tszi". The song is musical and has been rendered as "si-tsi-si-tsi-tsu-tsitsi".
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: Brown Accentor and Robin Accentor.