On the face of it Brecon & Gouesnou seem unlikely twins. Gouesnou is a small town on the outskirts of a bigger city, that of Brest, and very close to the sea and a wonderful coastline , that of Brittany. Brecon is a small town in Mid Wales far from the sea and any large cities. In contrast its natural beauty derives from the national park which bears it’s name. So in ‘looks’ at least the two communities compliment each other rather than resemble.
Both towns have a Celtic culture and a Celtic language which continue to exist within larger cultures strongly influencing both the English and the French which might have engulfed them.