How to remove visible dividing lines between model parts in Unity?

Hello everyone,

I’m facing an issue in Unity URP related to the appearance of my character. My character is divided into several parts (legs, body, arms, head, and face) to facilitate customization and clothing application.

However, there are visible seams between these parts of the model. I need to keep the model parts separate to be able to disable them as needed, so I can’t simply combine everything into a single object. And in blender it looks normal.

I have tried adjusting the normals during the model import in Unity and using different materials, but the seams are still visible.