Whilst we can't say for certain, we generally don’t integrate them together.

You can always make a “unified model” of dark matter and dark energy, and many physicists have done so, but there’s no compelling motivation to do so. If you think there is, you’ll have to provide a compelling answer to the following question:

“why is it more compelling to introduce one new, unified component that has two free parameters to it — one to explain the “dark matter” effects and another one to explain the “dark energy” effects — than it is to introduce two independent components that evolve independently of one another?”

If dark matter and dark energy are somehow related to one another, that relationship is subtle and not obvious to physicists given our current understanding of nature. Until we have some evidence that these two things actually are related somehow, we have to take the conservative approach.
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