how to apply same fields for objects with different script but inherit same class Unity C#

i have lots of classess who inherit BaseIsland (more then 20) each of classess have prefab and i wonna to fill a lot of fields with same value for each of them. but some of values type are like AnimationCurve some fields are with types of transform so how can i apply same Value to all of them?

probably i can create some object fill all fields and somehow using reflexion get these fields from that object and set these fields to each of them

If you have same values, use static properties.