So, is one end with a "dynamic ip address" and another with a static ip address? If so then next question will be which side needs to start the connection to which side? The dynamic to the static? or the static to the dynamic?
So if you have one dynamic and one static you can either have ezvpn or dynamic-to-static lan to lan, the catch here is that the one with the dynamic ip address always needs to start the connection to the one with static ip address, this is for both tunnel and traffic over the tunnel. Once the bidirectional tunnel is up, you can have bidirectional communication.