Your query made me wonder what I had been missing, since I never did notice any resemblance. I found this image of the actor, with a pose that could allow for a comparison (adding a younger Nabokov for fairness):

                     

Interestingly or not, Mr Sanders (despite the "help" of seven psychiatrists) decided to commit suicide on an April 25th. 

Carolyn Kunin

 p.s. Reading about Mr Sanders' life and his many marriages to many beautiful women (including two of the Gabor sisters)  reminded me of an interview I heard with Eddy Fisher during the promotion of his autobiography Been There, Done That. He was asked "What was the best thing in your life?" To which he promptly responded "that I loved so many beautiful women." "And what was the worst?" Pause of several seconds and the reply with a sigh, "that I loved so many beautiful women."