Quite possibly, dependent upon tariff deals at the time. Post WW2, Morris motors built a sub-plant in Dublin to re-assemble CKD Minors. CKD stood for ‘completely knocked down’. Each car basically arrived from GB as a kit and was reassembled in Eire. This got around the tariff on importing brand new - assembled - cars. Cross-border export would have varied, I suspect, as to how high tariffs were. Late 1930s were the worst I think for imposed duties.