Hi @tiffanymanus,
Thank you for clarifying. I understand how frustrating it can be when long-trusted presets suddenly look different after moving to a new camera. As @LAMY2017 noted, the underlying camera sensor and color rendering between the EOS R and the EOS R6 Mark II will be different. Even though the profile name in Lightroom may look the same (for example, Adobe Color), the rendering baseline has shifted because Lightroom applies the profile calibrated for each specific camera model. This is why presets that worked perfectly before may now appear warmer or tinted.
I know it feels like “starting over,” but once you adjust the baseline profile and update your presets, you’ll regain the look you’re used to while keeping them compatible with your new camera.
Best regards,
Anshul Saini