Servus cp380sx,
I have a set of those SXS forks disassembled in my garage and they are not that different from your 43mm forks. The cartridge is identical to the 43mm units, just tighter tolerances and a plated piston rod. The valving is 'burly', but nothing which couldn't be duplicated on your forks. I don't want to talk you out of those forks, but a revalve would surely make your stock units the better choice!
The reason I bought them was, that I got a great price and could switch my setup from the 43mm forks right over. I started with running the cartridge from the 48s with my setup in the 43s to make the transition as smooth as possible - no surprises. Next I'll switch anything to the larger tubes.
Michael