Henning,
This is a Mosquito FB.MkVI Series 2
It has 4 20mm Hispano MkII cannon with 150 rounds per gun and 4 .303 Browning machine guns with 500 rounds per gun.
Ordinance wise it can carry 2 500lb bombs in its bomb bay and 2 500lb bombs under its wings or 8 60lb rockets under its wings.
The Mossie with the 57mm Molins gun was the Mosquito FB.MkXVIII. The 'Tse-Tse'. The FB.MkXVIII is a modified FB.MkVI Series 2, same engines, with the 20mm cannon removed. I don't know about its ordinance load.