Not really - I think we both became league clubs in the same season on the formation of the Third Division South.
Until then, the Football League consisted of two divisions with the only member club south of Birmingham being Arsenal.
Which means that all those Lancashire clubs having impressive numbers of League Championships in their histories seems not as impressive after all.
When the southern clubs were all in the Southern League, Saints won THAT championship 6 times, and Pompey won it twice.
Of course, that fact is forgotten by the people at the wrong end of the M27.