beatmania IIDX 4th style .MGP variation

[HIKARUfw]

.MGP is the graphic repository file used in early beatmania IIDX arcade games
while the variation used from the first game up to 3rd style can be viewed with relative ease,
the files from 4th style seem to be obfuscated
upon basic analysis, i found this repeating pattern in most of these files (areas that are likely unobfuscated 00 bytes?)

help with a script would be very appreciated
below is a zip file containing variants of the same file ripped from 3rd style (non-obfuscated) and 4th style (obfuscated) to help

[rabatini]

Did you take look in here?

https://github.com/SaxxonPike/iidx-ps2tools

[HIKARUfw]

that repository doesn't seem to have what i'm looking for