These are used slightly differently. "As of now" can imply that something is currently true, but may not remain true indefinitely. For example: "I had been out of work, but I recently found a new position. I am employed as of now, but we'll see if that lasts." "From now on" contrasts with the past. For example: "You currently come and go as you please, but from now on you must let me know when you are leaving and what time you will return."

no, they are not the same. ex. as for now, i can call her (but may be in the future i will not be able to call her) from now on, ex. from now on, we are good friends, (we were not friends in the past but we start friendship now and we will be friends in the future)