Not correct.
I cannot recall any card which shows two different evacuation paths in case of ground landing or water landing.
Your recollection may not be very good, then...
I have never flown Ryanair, but I fly extensively on many airlines. When I get on an airplane, the FIRST thing I check is the exits available for a water landing. I have found that is the MOST varying factor among airplane emergency procedures. On US airlines, the information is on the card on ALL airplanes.