These two species are similarly marked with small spots.

Udara dilecta.
Wings with submarginal spots/lunules.
Postdiscal spots more or less evenly dark.
Ground whitish.
https://yutaka.it-n.jp/lyc4/80760001.html
https://wingscales.com/Lycaenidae/Udara-dilecta-dilecta
https://www.gbif.org/occurrence/2847200139
https://www.gbif.org/occurrence/2847201825


Udara rona.
Uperside deeper blue in both sexes.
Underside postdiscal spots paler ,mostly light yellowish brown often faded.
https://www.gbif.org/occurrence/2847201863
https://www.gbif.org/occurrence/2847201850
https://www.gbif.org/occurrence/2847201828
https://nlliew66butterflies.blogspot...uhstorfer.html