different between ifackins vs fackins

English

ifackins

(archaic) A mild oath.
- 1749, Henry Fielding, The History of Tom Jones, a Foundling
  I don't pretend to give your la'ship advice, whereof your la'ship knows much better than I can pretend to, being but a servant; but, ifackins! no father in England should marry me against my consent.

Corruption of fay, faith ( +? -kins).

fackins (uncountable)

(obsolete) Used in exclamatory phrases to express surprise, insistence, etc.
- 1749, Henry Fielding, Tom Jones, Folio Society 1973, p. 152:
  I suppose he hath left me mourning; but, i’fackins! if that be all, the devil shall wear it for him, for me.

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