I don't think it's fair to say that our Saints were Roman Catholics. I do believe Theodore Romzha was authentically Byzantine, not Roman. Also note that our history is tightly knit with Ukrainian, Slovak, and other Eastern Catholic churches. Here is a list of some on their way to canonization. If there are any more, please add them. I'd love a complete list.
St. Josaphat Kuntsevych
Blessed Miriam Teresa Demjanovich
Blessed Theodore Romzha
Blessed Pavel Gojdic
Blessed Basil Hopko
Blessed Vasyl Velychkovsky
Blessed Klymentiy Sheptytsky
Blessed Volodymyr Pryjma
Venerable Petro Oros (Beatification approved 2022)
Venerable Andrey Sheptytsky
https://web.archive.org/web/20141129055636/http://www.ugcc.org.ua/35.0.html?&L=2
https://www.vatican.va/news_services/liturgy/saints/ns_lit_doc_20010627_carneckyj_en.html