I guess they are somewhat alike in personality.
If Nole hadn't become a top player in his early career, hung around in top 30~50, so they hadn't asked him to be mature, he might have been more Radeklike barring the outfits, maybe.
He would always have been better looking though
Am now thinking of Novak wearing Radek's ghastly purple outfit
It creates a very strange picture in my mind