Just a guess..
...but is the file the exact same size as the original? I had messed around a while back by changing the rubber dinghy collision sound to something other than that horrendous ship collision sound. I found that the file size had to be the same otherwise it didn't work.
I ended up changing it back as it affected all the other ship collisions (i.e. the devs used one sound effect for all ship collisions regardless of their size including the rubber dinghy for the spy dropoff missions, a terrible oversight but we're stuck with it.)
It could have been something else but my conclusion at the time was the file size. Hope this helps.
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