Alpine Accentor
Prunella collaris
This is a robin-sized bird at 15–17.5 cm (5.9–6.9 in) in length, slightly larger than its relative, the dunnock. It has a streaked brown back, somewhat resembling a house sparrow, but adults have an all-grey head and red-brown spotting on the underparts. It has an insectivore's fine pointed bill. Sexes are similar, although the male may be contrasted in appearance. Young birds have browner heads and underparts.
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: Alpine Accentor and Robin Accentor.