Is LDraw diverging from bricklink?

[Philippe Hurbain]

If you mean the so called 6538c, it's because this numbering is plain wrong. There is one and only one proper number for this part, 59443. In the past it was possible to correct wrong part numbers on Bricklink (and I did have quite a few corrected!), but since the great database failure at Bricklink the part correction form is no longer working (perhaps it's repaired now, I have not tried recently)