The key in C&P4 is quite specific in this differentiation.
Still , this should be easy to test.
The upperside FW border is a thread in the male A. kurzi.
https://singapore.biodiversity.onlin...doptera-000440
The upperside border in A. avathina is much wider , 1mm.
https://m.singapore.biodiversity.onl...doptera-000436
TL Seow: Cheers.