I checked my Activity Monitor for both and here's the results:

Here are my findings for the other Myth Apps I have:
- Myth I 1.5, PowerPC/Rosetta
- Myth II 1.7.1, Intel
- Myth III 1.3.1, PowerPC/Rosetta
- Ballistic 1.1, PowerPC/Rosetta
- Dialog Editor, Intel
- Oak, Intel
- OmniPatch, Intel
- Patchwork, PowerPC/Rosetta
- Soundblighter, PowerPC/Rosetta
- UnTag, Intel
- Vengeance 0.1, PowerPC/Rosetta