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Horizontal Honda engines vs Vertical

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I've posted this question in another forum with no real response, so here it goes again. I have a '74 cr125 that has a sl125 in it. Im not a huge fan of the SL motor. I've thought about building a big bore xr100 motor for it, but after comparing it to a horizontal honda that I have here, I can't really see any benefit of the small upright motor to the horizontal. This xr70 head has pretty much the same size valves as the xr100. The xr70 motor has a roller cam. The 100 doesn't. Am I wrong in thinking displacement being equal they should make about the same for power? Maybe even a touch higher for the horizontal?

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