Downloading Specific Rigs

I've waited long enough to ask this question but when I download a presetting called Eric Clapton, for instance, do I need to tweak it to my liking? Most all presets on my new Eleven Rack sound pretty much the same except for some minor differences. Only one I've found was the EC preset that resembled the tone of the mans guitar.

Appreciate any advice.

well clapton uses single coil pickups, so if you have humbuckers you will need a little tweaking to make it sound like his... on the other hand you may want to use a certain preset to use as a starting block to get the tone your after. it's your ear and your preference to get the sound you want.