Joe and my first comparison looked at the comparison originating in 15288. I see a few things here:

• Some impactful activities happen outside the described stages
• Terminology is not consistent
• if page size of the stage is important, these are also inconsistent

As we progress in detailing the meaning of the suggested phases, I expect there will be more commonality than is first implied. (click on it for a more readable size

The latest reference found for the DOE is DOE Systems Engineering Methodology V3 from 2002.