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Only thing I could find is the following .
My understanding of the e-locker is that it dose use the original ring gear and pinion gear. So if the factory diff lock has different specs to the LSD, which the e-locker has been adapted for it won't fit. As there is an e-locker for the front and a different one for the rear, they don't have one for the factory diff lock which makes sence. That could be a reason for it being incompadable. As for your factory locker, when I got my patrol I found that the diff lock wouldn't work. I was given advice just to tap the diff housing with a hammer to free things up a bit. I must say I gave it a bit more than a tap but it has been working perfectly ever since and I actuate it a least once a month just to keep things freed up.