So no, no problem with zip at all.
So yes, lots of tools, in fact, it's the same thing, i don't know why RITC is offering both, did you try google ? You want a name ? YAMB.
Android does not need mp4, Samsung are DivxHD compliant, and these days, DivXHD means MKV.
You will loose chapters, ritc mp4 does have chapters

Note : A new version of the audio album is available on ritc without bug at track 4 1'04