Finding which source is the correct one for a compiled class file

I have a compiled class (myclass.class) and 3 source files for it (myclass.java). Is there any method, utility, or software that will let me find which source file is the correct one?
I have about a 100 of these classes which have a lot of copies of the source and we don't know which source is the correct one. The compiled classes are deployed and working and cannot be replaced.
Thank you for your time!

Thank you all for your suggestions but..
1. Recompiling the existing sources and checksum the compiled classes is not a full solution. In addition to finding the version of the compiler that was used and the version of the JDK libraries that were used, I do not know which switches were used when the class was compiled (e.g. -g will output debug info, etc.)
2. Decompiling: I could not find a good enough decompiler I tried jad which failed with some of the classes; I tries JDec which I did not feel I can fully trust the output (format was less accurate than jad). I tried jode which is limited to java 1.3.
3. Versioning: our project now is actually to move all the source to Subversion.
If there is a better decompiler or a way to ensure that a given source file matches the compiled class, please let me know.
Thanks in advance!

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