Look at the Atlantic Bridge Program - The Atlantic Bridge Program: US and Canadian students studying medicine in Ireland
That should give you most if not all of what you need to know about the Irish schools and applying to them.
As for a "transfer", I would not hold out much hope of gaining credit for your Charles studies and moving directly into 2nd. year in Ireland - but you've nothing to lose by trying.
"Ever tried. Ever failed. No matter. Try again. Fail again. Fail better."
Samuel Beckett, "Worstward Ho", 1983