First of all, never trust private servers for much of anything.
Second, you can extract the interface art files to have a look at which files are which, if names have changed, etc, etc.
https://wowwiki.fandom.com/wiki/Extr...nterface_files
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"You'd be surprised how many people violate this simple principle every day of their lives and try to fit square pegs into round holes, ignoring the clear reality that Things Are As They Are." -Benjamin Hoff,
The Tao of Pooh