As vray displacement only works with map applied to the group/component, not face, how to control in sketchup the UV mapping for that texture? See the example here Imgur: The magic of the Internet
I would like to move the texture on one of the sides so I can align textures more precisely
The position and transformations of a texture applied on a face will affect the displacement mapping. It just needs to have the material with displacement applied on group/component level as well. In your case, you can easily fix the misalignment using the V-Ray UV tools from the toolbar or the context menu:
