Is a buffer name unique?

I'm trying to cleanup an interesting tip that automatically
manipulates the quickfix list with a QuickfixCmdPost event.
The tip sorts the list by file name and line number and omits
duplicates:
http://vim.wikia.com/wiki/Automatically_sort_Quickfix_list

A custom sort function compares two items in the quickfix list
and the following code is used to determine whether the two
quickfix items have the same buffer name:

if bufname(a:i1.bufnr) == bufname(a:i2.bufnr)

The argument a:i1 is a quickfix item; it is a dictionary and
bufnr is a field that specifies the number of the buffer
associated with the quickfix item. See ':help getqflist()'.

Is the following line equivalent to the code above?

if a:i1.bufnr == a:i2.bufnr

I do not see how two different buffers could have the same
bufname(), so just checking the buffer number seems sufficient.
I concede that this is probably not worth worrying about, it's
just my curiosity and wondering what I'm missing.

John

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