One is set in 1901 and one is set in the modern world. From wikipedia's page on Brittany.
"In 1956, French regions were created by gathering departments among them.[5] The Region of Brittany comprises, since then, four of the five Breton departments (80% of historical Brittany), while the remaining area of the old Brittany, the Loire-Atlantique department, around Nantes, forms part of the Pays de la Loire region. This territorial organisation is regularly contested. The Kingdom and the Duchy of Brittany, the province of Brittany, and the modern Region of Brittany cover the western part of Armorica, as it was known during the period of Roman occupation."
So, as you can see, in 1901 it wasn't officially called "Brittany".