If I have 2 urls:
Is it different? The answer is Yes!
Long story short Google does not care if you have a trailing slash. However, it will treat the above 2 paths as separate pages.
Why? URLs with a trailing slash to indicate a directory, and those without a trailing slash to denote a file.
http://example.com/foo/ (with trailing slash, conventionally a directory) http://example.com/foo (without trailing slash, conventionally a file)
If you need to have both of the above and they are the same content your best option is to do a 301 Redirect to one of them from the other.