To explain in the simplest case, the newly combined product you mentioned is not protected by patent law. If this new situation needs to be protected, a separate patent application will be required. Whether a patent can be granted depends on whether the combination is obvious, can solve new technical problems, and achieve new technical effects.
The real reality is very complicated. For example, a patented product may have only one technical point protected by the patent law, and there may be multiple patent claims. Are you only using the technical features in the dependent claims, etc. wait. It is necessary to combine patent documents and comprehensive product evaluation.