[Leendert]

The collision was actually on 18 October 1960. Online archived Dutch newspapers report the Sabres collided head on at around 4 p.m.

Harrie: big parts of the Sabre of the killed pilot are said to have landed on a barn of Mr Adama, Boerendiep, Stadskanaal.
The barn later burned down.

The other Sabre came down behind the house of Mr. Van der Laan, Schoolkade, Nieuw-Buinen, west of the railtrack Stadskanaal-Ter Apel.

Perhaps one of these locations match the place where you found pieces of one the aircraft?

Groet,

Leendert