I’ve never heard or read of the Roman Catholic Church providing help during the Irish Potato Famine. It’s possible that they ran some of charitable soup kitchens, but bear in mind that the RC Church in Ireland would have been badly affected by the situation, too. I’m sorry I can’t be more helpful.
The Catholic Church in Ireland received world-wide financial support from the church throughout the world during this period to assist the needs of the people. In addition, American Irish-Catholics as well as non-Catholic Americans provided unprecedented financial support to the cause. See the article on the famine by the Rev. Donal Kerr, Emeritus Professor of Ecclesiastical History, St. Patrick’s University, Maynooth, Ireland at the link below