7za.exe ver 4.33 found from p7zip_4.58_src_all.tar.bz2 is an old version of 7zip Windows console executable. It just happens that p7zip project uses it as a test vector to verify p7zip build executable '7za'. Test vector mean data file to check compress/uncompress operation. It is up to you if you want to use this OLD 7za.exe 4.33 for your Windows/Cygwin. The current 7za.exe is from 7za460.zip.