Would you know if 'Kostka' was added sometime after 1867
No, Saint Stanislaus (the Martyr) and Saint Stanislaus Kostka are two different saints. You should try to contact parish in Szczepanów as it's the only one in Tarnów diocese that is dedicated to Saint Stanislaus. According to Wikipedia Saint Stanislaus Kostka Parish in Tarnów was created in 1980.