These two are very difficult to separate in field shots.
Part of the blame is that in the net the IDs are all mixed up so that it is hard to gauge which is correct.

These images are all from Singapore where only Borbo cinnara occur.
http://2.bp.blogspot.com/-KaVjdL_FAM...lt_Khew_01.jpg
http://3.bp.blogspot.com/-I6ExYM1XQv...bo-cinnara.jpg
http://www.butterflycircle.com/check..._Horace_01.jpg
http://www.butterflycircle.com/check..._female_01.jpg

http://yutaka.it-n.jp/hes/93060001.html

These images can reasonably said to be correct for Pseudoborbo bevani.
http://farm9.staticflickr.com/8335/8...1f535518_b.jpg
https://www.ifoundbutterflies.org/me...0d2810f0-1.jpg
http://dearlep.tw/images/Papilionoid...E%E8%8A%B3.jpg
https://www.thaibutterflies.com/wp-c...i-1080x722.jpg
https://farm7.static.flickr.com/6076...d6b655d5_b.jpg

http://yutaka.it-n.jp/hes/93070001.html


The main difference are ,B. cinara UnH spots sharply defined; antennal shaft mostly dark; UpF spots 2 & 3 irregular.
P. bevani ;UnH spotspoorly defined ,blurry; antennal shaft paler, often with a pale area behind the club; UpF spots smaller & rounded.


Your shot with sharply defined HW spots & dark antennae indicate it is a female Borbo cinnara.


TL Seow: Cheers.