I don't know if it has to be the same length or not.
Since it was listed with the length already, I went ahead and made them the same. I imagine you can just change the length values in the soundresources file and go from there.
Or you can try just putting a random length silence file there and test it out to see if it crashes. I recommend backing up your save file beforehand though in case it does.
If someone manages to pull this off, can they post them.
Are you asking for someone to post the silenced files? I can do that when I get home I suppose.
Like I said, however, I can only confirm that it is working for the English-International version as that is what I am using. No idea if it will work with any other Locales, as the files may be named different.
If someone with one of the other languages can check their soundresources.txt file, we can know for sure.