It's pretty close to Sharp's A version from N.C. but it could have been collated from the first few of Sharp's versions.

Personally I'm not keen on the title 'Earl Brand' being used for these more common ballads 'Lord Douglas's Tragedy'. Child lumps both ballads together as they are variants of the same story, but they have no text in common and are even in a different form. Nowadays we tend to say that 2 ballads with the same story but no text in common are different songs, e.g., 'Bramble Briar' and 'Merchant's Daughter and Constant Farmer's Son'.

It's quite possible that both ballads were separate translations of the foreign sources, rather than one being a reworking of the other.

It doesn't affect your website much except for the mismatched title as all the American variants are derived from LDT.