'Fraid it can't be that one, at least according to 'For Your Tomorrow' Vol 1 (NZ'ers who died in RNZAF and Allied air services).
(Z1616 AA.D) Took off at about 2330 captained by Plt Off R Bertram, RAF but crashed and caught fire five minutes later near Red House Farm at Methwold, 3 miles NE of the base. The five crew died, all but the captain and navigator being buried at Feltwell.
Of the two RNZAF on board, Mitchell was 25 and this was his 4th op, Grenfell was 22 and on his 14th.
JT