It's OK to combine them -- they shouldn't self-destruct or anything. However, it might be harder to diagnose what's wrong if your hair doesn't like something, so keep that in mind.
I wouldn't mix the 2-in-1 shampoo/conditioner mixtures with the conditioners, but I'm sure it would work to mix multiple bottles of those together. If you mix them with your normal conditioners, you'll be reducing the conditioning properties they have by adding detergents to the mix.
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