cgr to cdr conversion describes using of CG4 graphics content in CorelDraw, which is certainly possible. CG4 (CALS Group IV) is typically used for raster content, so might as well be used as objects or elements in new CorelDraw graphics document.
You can find numerous guides and tutorials about using raster images on both Corel sites as well as Internet and YouTube.
Updated: November 6, 2023