[Балагур]

Hello! I want to find out what the signature is correct, on the first or the second picture. Could Nikolai Kuznetsov is not quite the same sign in different periods of his work ? As far as I know , he bought the painting in the studio sketchy plan without a signature, and possibly asked to sign. Can stand in his paintings later signature? Surely someone has a picture of this master. Please share their views .
Yours!