I have noticed that, regarding character, both Kirk and Riker have some similarities - both are womanizers and can be cheeky. There are certainly differences, such as Kirk being much less formal than Riker at the best of times, and Riker not having as much of a risk-taking attitude as Kirk. Now, it could be that I'm just seeing similarities where there are none, but with the success of TOS perhaps the producers may have wanted to reprise the character of Kirk a little in Riker.
My question: was Riker actually based on Kirk, or at least partially? (I say based, as, although there are some striking similarities, they are far from identical)
I'm looking for evidence from the actors, producers, directors, or writers to confirm or deny this contention.