You can import a GCI file to Dolphin memory card and then start Radiant Dawn. If both games are from the same region (eg. NTSC/NTSC) then it should work fine. Different regions may cause you troubles (e.g. NTSC/PAL or PAL/NTSC)
Avell A70 MOB: Core i7-11800H, GeForce RTX 3060, 16 GB DDR4-3200, Windows 11 (Insider Preview)
ASRock Z97M OC Formula: Pentium G3258, GeForce GT 440, 16 GB DDR3-1600, Windows 10 (22H2)
ASRock Z97M OC Formula: Pentium G3258, GeForce GT 440, 16 GB DDR3-1600, Windows 10 (22H2)
