Could not able to do Change/Set family type

Hi All,
I am creating a sample tank. In that process, I have created tank floor with preset floor named " Tank Cover Floor- Varying Thickness". Later I am importing floor thickness value from spreadsheet and changing the floor type name as per the thickness. e.g (Tank Cover Floor - 0.15m Thick). But I could not succeed with the node. Could anyone suggest some solution for this?

Please note, I could able to set the structural column(From preset to another name) as per the above mentioned process.

Floors are system families and likely won’t work as a FamilyInstance. You may have to try another way.
Edit: It could also be because you’re supplying the FamilyType instead of the FamilyInstance.