How can I make a diferent inspector for a component in a prefab and in the variants?

I have a gameobject that I use as a model prefab and using it i generate variants for the scene (Editor mode).

I want to see all variables available when i am editing the model but for the variants only a few values.

How can I make it?

I tryied with https://docs.unity3d.com/ScriptReference/PrefabUtility.IsPartOfVariantPrefab.html but always returns false.

Thanks in advance