Slovakian Pilot Otto Smik DFC 9N B or 9N R ?

[Andy ingham]

On 28 November 1944 Otto Smik DFC was hit by Flak while attacking a rail target near Zwolle in Spitfire XVI RR227. His plane crashed and he was killed.
I have conflicting reports as to the code of his aircraft.
I am led to believe the book 'Zij Vielen Rondom Zwolle' (They fell around Zwolle), written by J.L. Schotman states the code was 9N B, however, according to the book 'Spitfire nad Evropou' about Otto Smik by Jiří Rajlich published in the Czech Republic in 2004, RR227 should be 9N-R.
I don't have either book so cannot verify if this is correct or the source of the information used by both authors. could someone check for me.
So which was it B or R?
I also have have been led to believe that W/O Reg Eckert RAAF was fling SM253 Coded 9N R.
I am waiting for a copy of his log book to verify this.
Regards
Andy