Collision between two Czech Spitfires 15 June 1945

I am trying to tie two pilots to two aircraft but have conflicting information.

Can anyone help?

On 15 June 1945 W/O Landsmann of 310 Squadron collided with another Spitfire of that squadron flown by V.Popelkou.

Landsmann was killed (missing) and Popelkou evidently baled out safely.

I have MH323 at Potter Bridge, Suffolk (Norfolk?), and HM330 in sea off Southwold.

Is this correct? And which pilot was in which aeroplane?

My notes and published sources do not agree.

Anyone help?