If a Preset has been designed to adjust ALL adjustments- It WILL overwrite any and all previous edit adjustments (as many purchased presets will do!)
If a Preset has been designed with only one (or several) adjustments (as you might do yourself!)- then it will only over-write only the selected adjustments. Example: A preset with only 'Exposure' will not over-write 'White Balance' edits.
To compare Develop Presets- You can simply 'Preview' a Preset by hovering the mouse cursor over the Preset names.
If you want to apply Presets to the same image and compare then-
In Lightroom create a Version 'copy' of the image.
In Lightroom-Classic create a Virtual Copy.
Regards. My System: Lr-Classic 12.2 Photoshop 24.2, ACR 15.2, Lightroom 6.2, Lr-iOS 8.0.8, Bridge 13.0.2, Windows-11.