Krauser and HUNK's themes when played in The Mercenaries are taken straight from P.N. 03, which was released as part of Capcom Five's GameCube game release 2 years prior to the release of Resident Evil 4
Krauser's theme in Mercenaries:
P.N. 03's "Fourth Mission":
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HUNK's theme in Mercenaries:
P.N. 03's "Eight Mission"
Krauser's theme in Mercenaries:
P.N. 03's "Fourth Mission":
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HUNK's theme in Mercenaries:
P.N. 03's "Eight Mission"