我源为一个DLL，我有它的编译版本躺在附近的某个地方。

I have the source for a DLL and I have a compiled version of it lying around somewhere.

如果我编译源就会产生不同的日期已编译的版本。

If I compile the source it will have a different date to the already-compiled version.

如何判断他们是否实际上是相同的，都只是被编在不同的时间？

How can I tell whether they are in fact the same and have merely been compiled at different times?

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怎么样MD5哈希？