Names that were used for
Non-Restricted Chromed Lined Barrels were;
CZH 2003 or VZ 58L
The difference between these 2 & the CZ 858 reciever are shown below;
Other than this minor difference in the receiver and the fact of a chromed lined barrel there is no difference.
As for the Rauch re-finishing process it does not make your rifle rust proof but does add some resistance to it. Also there is
Murdoc's Arma-Coating job that is a ceramic style 2 part epoxy paint that also provides rust resistance and also increases cool down rate because of the ceramic feature. Although both firearms will rust out on you if you never clean the inside, shoot corrosive ammo and live in high humidity area's such as the "
Wet Coast". This issue will also be the same if you have a chrome lined barrel.
This is just some of my personal use perspective & I hope it helps you out.