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If the required rate of return is higher than the IRR of each project, NPV will be negative and both NPV and IRR will return a decision to reject the project.
If the required rate of return equals the IRR of each project, NPV will be zero and the NPV method and the IRR method will rank the investments the same.
When projects have unequal lives and the sizes of the investments are different, it is possible that NPV and IRR will rank the projects in a different order.
When the lives of multiple projects are equal and the size the required investments are equal, the IRR method and the NPV method will return the same accept-reject decision.