I compared the video from the mp4 link with the video from the m3u8 link, and they seem the same to me, aside from the quality differences - of course.
I didn't count the frames or anything, but they are both 3:27 in duration. The 720p m3u8 link is only about 2400k bitrate; I didn't see anything higher. Maybe you got a different file if it is 6000k.
644x362 mp4 link;
Code:
http://cdn.video.abc.com/video/mp4/644x362/JKL_20140331_DANCROLLPERFORMSFRO_SHOWCLIP_4ef4431e-3f70-4fec-9146-64aedb79fcdc_10011412.mp4
1280x720 from m3u8;
SHOWCLIP_4ef4431e_1280x720.mp4
(result from m3u8 link using ffmpeg to download)