I would recommend using FDR_Ground_Tiles_A1, FDR_Ground_Tiles_A2, and FDR_Outside_A4. However, personally, I would use the ground tiles from FDR_Dungeon_A5. The same goes for the walls, as they won’t work properly as an A4 tileset due to RPG Maker’s restrictions, the tiles would have to be drawn on an 8×8 canvas.