How does the action of these two Purushas differ in manifestation, in case they are different?
The Vigyanamaya Purusha is indeed the Divine Being in His Supramental poise whence He is simultaneously and fully conscious of Himself and all the worlds and their forces in each and every movement. It is the grand poise in which He is the Lord of the worlds, the Creator who is the Ishwara with an absolute knowledge and absolute power, the ordainer of the law, the controller, the nourisher, an absolute with all the varied relations possible with the world of relativities.
The Akshara Purusha is His poise of the Eternal Witness watching over everything, involved in nothing, yet upholding and containing within IT everything, the stable ground of the ever changing dance of creation supporting all by Its Silence but participating in none.
If one wants to use an image from the Puranas, Akshara Purusha is like Shiva lying below the feet of Kali supporting as well as steadying her feet in the cosmic dance. The Vigyanamaya Purusha is like the Ardhanarishwara where the Lord and His Shakti are in perfect union with each other.
