The WinSxS folder is 'supposed' to have duplicates of system and other components files. This is one of the main reasons for it being created in the first place.
If you remember "DLL Hell" where you would have software installation programs that would overwrite system dll files with their own versions and cause other programs to break in the process. This was a huge problem and the WinSxS folder was created to solve this problem.
WinSxS contains multiple versions of many files so that a program can use whatever version that it was created for, without bothering other installed software programs on the system.
Deleting duplicates in this folder will have only one result. A complete reinstallation of the operating system and other programs.
Ronnie Vernon
Microsoft MVP