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If you are now using the offical PAL SNES RGB scart cable then that PAL Gamecube cable will result in a too bright picture. Using a cable with a sync separator is not recommended.
The best cable at Retrogamingcables is the Packapunch fully shielded cable. https://www.retrogamingcables.co.uk/nintendo/super-nintendo/packapunch-pro-super-nintendo-entertainment-system-snes-rgb-av-scart-cable-pal
You will need to ask them to make a cable with Composite video sync without sync separator because they only list it with Csync(LM1881) and Luma sync.
RetroRGB made a video comparing shielded vs unshielded cables and showed that with a shielded cable with Composite video sync you will not see the diagonal bars. https://www.youtube.com/watch?v=HV2cSKhO6v0