There are some spam issues in the comments, so I had to disable comment editing for a short time. It'll be back once the spam bots are gone. FYI... they leave a comment with "great" and then edit in the spam stuff later, to get around the filter.
(officially, the difference to "das Selbe" is that "gleich" is about same kind of item, while "selbe" is about the actual same item. But in practice many people (including myself) use them synonymously)
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The meaning of "gleich"
A fun look at the meanings of "gleich" and why it's "equal" and "immediately" at the same time.