Lazy man codec pack (even the beta 1.1 version mentioned there) it's more than 1 Year old. It can have incompatibilityes with newest video files. It also does not contain an AVC decoder requiered for x264 files. So it can't conflict with the codec pack mentioned above.
Also...see at the bottom of the page you mentioned:
Quote:
Related Downloads
This pack will enable you to play MKV files with any DirectShow players, but Media Player Classic (MPC) is highly recommended. Use newer ffdshow that can decode not only XviD, DivX, AC3, AAC, etc. but AVC (x264).
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