IIRC, 749S forks are Showa, same as '03 999 BP forks. As long as both have non-radial brake caliper arrangements, the forks themselves are a straight swap. I now invoke Cunningham's Law.
I put ohlins forks from a 2004 999S on my 2006 749S. The earlier 999S models use non radial brake calipers the same as the 749 which means it's a straight swap (you'll need a 56mm bottom yoke also). I managed to pick the forks and yoke up from Italy for just £560!