The physical and the virtual cards are independent, each one has its own data, and you can use the one you are most interested in at any given moment.
The difference between the green card (physical) and the purple card (virtual) is that in the physical card, the card details are only accessible on the physical medium, on the plastic. The virtual, on the other hand, has card the details are accessible in the application, in the ‘virtual card details’ section.
If you ever want to make an online transaction, and you don't have your physical card at hand, you won't be able to do so, as the card number, expiry date, and CVV are only on the physical card. The virtual card will be handy for this, since those data is always available to you in your app.
You can add both to the wallet and pay with them from there, for the virtual card, the wallet is the only way to pay in physical shops, through the mobile, while for the physical card it is a plus, as you can also pay with the card itself in the dataphone.