I'm just finishing up rereading The Zero Stone and Uncharted Stars after forty years or so, and I've realized she wrote many more books in the same general setting -- I recall Zacathans, for instance, in another book I read about the same time I first read the Murdoc Jern books. I remember one title: Forerunner Foray, but Norton's short bio mentions tens of books in the space setting. What titles are those, and in what order should they be read?
In looking around, I found two sites that give series and stand alone books in both publication and chronological order.
Both of these list the publication order, and then if it is different, the chronological order. For the two you mention they are listed only with a publication order.
As I cannot find a source that lists any of the books in sequence other than series, I think they are basically standalone books and if you read them in publication order you are ok.
A general timeline of Alice Mary North's huge list of work is here:
This ties together a LOT of her work, but may help you eliminate reading choices from the confusion.