There are eleven similar black & white Neptini butterflies in P. malaysia.
You generally need the upperside more than the underside as the important FW postdiscal spots in space 1b & the lower margin would be hidden by the HW at rest.
They may be divided into two groups.
Neptis group 1 in which spot 2 & 3 are more or less parallel to the submarginal spots.
Neptis group 2 in which the postdiscal spots runs obliquely to the submarginal spots.