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Females of A. sp. Twin/Zwilling & A. sp. Harlequin/Harlekin are very similar. Harlequin never shows a red caudal margin. The female in the pictures shows a hint of a red caudal margin. My guess is a female Twin.
Yes, there are slight differences in the cheek stripe as well as the size & shape of the lateral spot and caudal spot. The red margin is just easier to see.
OK
I asked because my female of this species does not show any orange in the tail at all. But I wouldn't know if this is common or not, as this is the only female I have ever seen live.