[BirdPhotoIndia] Id Confirmation Please

The first two shots are from Khonoma, Nagaland ( Sept'11) and the last two from Lava, north Bengal.(Apr'11)

Are they both Black-throated Prinias , the first being P.a. khasiana and the latter, P. atrogularis ?
or are any of these birds a Hill Prinia - Prinia (atrogularis) superciliaris ?

Would be much grateful for help with this confusion.

Thanks in advance.

Soma Jha

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