Yes!
For example if you ordered 1 corner rounded; it can be any of the four corners. Remember when setting up your design to take into consideration how the card is flipped; see: Orientation.
If you need to change the number of corners that are rounded, the configuration (such as 2 corner same-side to 2-corner adjacent) or corner radius, your order details will need to be changed. Please contact our Customer Service team if you need to change the details of your order.