I have now find a solution for this problem and posted it in the linked thread: "The argument -page will control a consistent size in the document. In my case I needed just to use "-page A4" to scale the images to the same size as .odt documents."
I have now find a solution for this problem and posted it in the linked thread: "The argument -page will control a consistent size in the document. In my case I needed just to use "-page A4" to scale the images to the same size as .odt documents."