This is a demo scene of a Unity project that demonstrates how we can make a texture changing system.
You can click one of those two objects inside the scene to show a texture changer interface, then you can select available textures to change the texture of that selected object.
The source is available for free on this link below:
https://drive.google.com/file/d/1w6sdqB5eiCSJyyLD4b14NKgNTNn6-m6x/view?usp=sharing
Watch the demo video here: