Neptis is very difficult in the Himalayas with dsf & wsf & numerous species.
What I cna say is this.
You could download the Bio-one article by Smetacek.
https://www.google.com/search?q=nept...Dj0Duzp3KsocOM
Neptis nata.
FW submarginal spot more noticeably bent in at apex.
Dsf only with slightly larger spots.
FW cell-bar & cellend spot & HW postdiscal spots clear.
https://www.ifoundbutterflies.org/si...0debe9-1_1.jpg
https://www.ifoundbutterflies.org/si...780831-1_0.jpg
Neptis clinia
FW submarginal spots usually more evenly curved in at apex.
FW cell-bar & cellend spot & HW postdiscal spots sullied in wsf.
https://www.ifoundbutterflies.org/si...0e70ab96-1.jpg
https://www.ifoundbutterflies.org/si...25cd68ef-1.jpg
Dsf with broad confluent spots
FW postdiscal spot 3 triangular.
https://www.ifoundbutterflies.org/si...4f44cbd0-1.jpg
https://www.ifoundbutterflies.org/si...ee0d86ad-3.jpg
https://www.ifoundbutterflies.org/si...4567d9c1-1.jpg
Also similar N. soma butleri.
FW submarginal spots angled in strongly at apex.
Spots wide; HW discal band widen at apex; pstidscal spots tall.
https://www.ifoundbutterflies.org/si...4362c7-2_1.jpg
TL Seow; Cheers.