I don't think there is anything to gain from comparing the refrain with TLL except perhaps it might have suggested linking the 2 fragments of verses due to the similarity in the chorus. I think there were several minstrel songs referring to 'Pompey' though the second verse certainly is close to the first verse of TTL. A major feature of the minstrel show as it developed in the second half of the 19thc was to include some very nonsensical but familiar verses with an easy repetitive chorus along with the usual instruments and wild antics. The Amhurst version is then quite typical of the genre.