Neil, everyone...
You can just run the NetDrive installer on ArcaOS, and it will replace the Arca Noae version with the full version. It even keeps your NetDrive settings the same.
Slightly different outcome here, although this is OS/2 SMP 4.52, so not an out-of-the-box AN install.
Anyways...I have been using NetDrive for some years now, and have installed in the same configuration the AN ArcapMapper stuff, primarily for testing purposes.
Both work, one does not replace the other (as far as binaries go), from functionality perspective that is somewhat the case (with the already mentioned shortcomings of the AN solution), but the programs are different.
So
Glenn, you should be able to install NetDrive and have it functioning on it's own...but as mentioned, carefully navigate as both of these solutions attempt to deliver the same functionality.