[CentOS] Inquiry:How to compare two files but not in line-by-line basis?

Dear All
Can you please do me favor and let me know how can I compare two files but
not in line-by-line basis on my CentOS server ? I mean say row#1 in file1
has the same data as say row#5 in file2 , but the comm compares them in
line-by-line basis that is not intended . It seems that the diff cannot do
the job as well .
Thank you in advance
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