Yes eCart will set up PayPal Express Checkout.
PayPal Payments Pro is two services combined:
1) PayPal Direct Payment - This allows the customer to pay using a credit card and stay on your site throughout the entire checkout process.
2) PayPal Express Checkout - this option takes the customer to the paypal site to process the transaction.
The checkout wizard will create pages for both payment paths, if you only wish to use express checkout, delete the credit car form on the checkout page and leave only Express checkout button.