Being able to have seperate materials in houdini

Hello, not sure if this is the correct place to ask, but I’m currently need to use houdini for a university assignment but am having the following issue. I want to have seperate materials for an asset, but currently when I export my asset to unreal the asset is getting the same texture. I’m wondering if there is a way to prevent this?
For reference, this is the graph I have created in houdini below:

If anyone can help, it’d be really appreciated!