MKV vs MP4

Hi all,
I'm evaluating Matroska to use it as a container instead of MP4.
What I'm looking for is to reduce as much as possible the header that is loaded before decoding the video and audio streams,
that's because I intend to stream the file using a progressive download.

Do you know if Matroska can have a more little header compared to MP4?

thanks in advance

bye

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