"..."OOOO" steel wool..." With oil, not "OOOO" steel wool by itself. A light touch with a fine brass wire wheel in a bench grinder or rotary tool works too. Eye protection is essential. Assuming you have either of those.
All the metal would have the same 'finish'. Parkerizing is a term like Kleenex. It's actually a U.S. company thing. Comes in shades of grey(depending on the metal is goes on) or black. Difference is the chemicals used. Zinc based gives the grey. Manganese the black. There was no green. That's caused by long term storage in cosmolineicon.
There is also black phosphating that was/is used on FAL's etc. Same idea with different chemicals.
There is no touching up Parkerizing or the other coatings. It's a coating vs a finish like bluing. You can use regular cold bluing to camouflage bare spots though.
Isn't usual for the crests to be ground off milsurp Mausers. How easy is it to get K98icon parts where you are? You may want to replace the butt plate.
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