Yes. But Lithuanian and Latvian are Catholics are Roman and protestants in all three are on new calendar (not sure if any protestants use old calendar at all?). And not all catholics outside of baltic states were unites. E.g. western Belarus and western Ukraine has some Roman Catholics. IIRC there’re some Roman Catholic islands inside RF too, but they are tiny. Probably mostly artifacts of forced resettling in Soviet or tsarist eras.