In a grid, cards will fill all the available vertical space.
In such a case, all of the grid card's footers should be vertically aligned. Meaning, they should always rest in the bottom of their card. Even when one card has much more content than its neighbour, and thus fill more vertical space in it's body, the footers should still be aligned.
These kinds of situations should best be avoided. See the guidelines for more information.
This card has no header and short body content.
In such a case, all of the grid card's footers should be vertically aligned. Meaning, they should always rest in the bottom of their card. Even when one card has much more content than its neighbour, and thus fill more vertical space in it's body, the footers should still be aligned.