I tried comparing the Brunei strain from a breeder website in Brunei and I don't see much difference. Suggest you try to post at Bettabite. There are a few "sifu" that may answer your question.
Brunei and Sarawak is just so near and I believe the macs are quite the same. I did spot the irrids on the anal fin of the Brunei strain that I don't see in most pictures posted. Here's the link:http://uk.geocities.com/mohdnooradnin/
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