The amount of difference has to do with how heavily you warm balance.
I keep a Roscolux swatch book in my camera kit. That way, I have access to all densities of CTB (and, for that matter, CTO for cool balancing). There are times that I warm balance just a smidge because the camera and I disagree on what's a fairly neutral white. Other times, especially when shooting landscapes and around golden hour, I'll pull a little more warmth out.
It's all a matter of personal taste, but it's a handy thing to be able to do.
so the swatches are a good thing to have just in case. well i guess the more options you have the better things can become for you. looks like i`ll get some soon then.