If you mean a plus fare that includes priority, 2 cabin bags and 20kg hold luggage so your cabin bags should be included.
Just check it fits their size regulation and 10kg weight limit. If your second item is too large it will have to be gate checked at up to €40. If that’s the case you may be better off paying in advance for an extra hold bag at €25.
See: https://www.ryanair.com/gb/en/useful...lp-centre/fees