... but the model you are discussing is really not workable; the two databases will have overlapping order numbers as you switch back and forth, and customers who placed an order on A won't be able to see it when you switch to B. And if you shared a database that wouldn't work either; a 1.5.5 database will blank screen if 1.5.6 software is run on it, for example.
Have one live site and one test site.
Separate databases.
Try out fixes, changes, etc. on test. When you're happy, apply them to live.
https://docs.zen-cart.com/user/running/local_testing/
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