I agreed both should be Potanthus omaha as the HW veins are fairly dark dusted.
The 1st pic is exceptional for the wide overlap of the FW spots & the very large HW spot 6.
Still I would like to introduce a species very similar to P. confucius, a bit larger.
There is a possibility this could find its way to Singapore.
Potanthus pava. FW 15mm.
Abdominal end yellow with basal black line/narrow band.
FW band continuous as in P. confucius Overlap may varies.Male may have the base of space 2 yellow shaded (as in T. colon or besta)
HW with a prominent spot 5 in both sexes usually large espceially on the underside. Underside bands edged in black streaks, not spots. http://yutaka.it-n.jp/hes/92820001.html