if you don't want to keep cm3d2 then you're better off with
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version instead and read the instructions from there.
On jap version you need both games linked together to get full mod compatibility. It's not a one time thing. Save file will break if you unlink.
R4.10 does not include translation. That's a separate module you have to download and install from the master guide. It's a bit outdated. I'll try to recompile it again next week if I have time.
The 2 repacks in op were released more than 1 year apart. One is newer than the other and obviously more complete.
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is latest jap version.
I don't know who does the jap repacks so I can't tell you if there will be another.