I have only kept a pair of "yellow sunshines" but when I was trying to figure out what kind I had I unfortunately realized that the majority of the sunshines sold in the hobby could be crosses between the benga sunshine and marleri sunshine. I am no expert on determining the differences however I believe you would only really be able to see the differences with WC or known pure FX generations. Hope it helps and maybe post a picture of the ones you have any someone here can help you out, cheers.