If you're looking to alter the texture of a 3D model created using the Image to 3D feature using another image, you can easily do so.

First, select the draft model, then navigate to the Texture step. Here, replace the existing image in the image uploader by clicking "Re-upload" and continue your new desired image.

Keep in mind, however, that the new image may not be fully incorporated into the generated texture if there are differences in the geometric structure between the two images.