Fwiw, A319 FCOM has no difference in the holding speeds for the different engine types.
Applicability:ALL.
They are established for flight in a race track holding pattern for two different configurations: • Clean configuration at 210 kt and green dot speed • Configuration 1 at 170 kt and S speed.
Green dot speed in clean configuration and S in CONF 1 are speeds between the minimum fuel speed and the minimum drag speed.