Blofeld's Voice
In From Russia With Love the voice of Blofeld was provided by Eric Pohlmann.
In Thunderball his voice is provided by Joseph Wiseman, who had previously played Dr. No three years earlier. This is documented in several books about the making of the 007 films.
How come IMDB insists on incorrectly listing Eric Pohlmann for the voice of Blofeld in Thunderball? I've now seen several other sites where Pohlmann is also incorrectly listed for this film and people are discussing him having done 2 Bond films.
If anyone has any doubts about this, just compare Blofeld's voice in the two films and you will hear the difference. Then listen to Joseph Wiseman in Dr. No. It is clearly his voice as Blofeld in Thunderball.