Which code should be selected when exporting from SoftPlan to REScheck?
See the U.S. Department of Energy code adoption map here.
Is there a way to export to REScheck-Web?
Install the windows version of REScheck. Export your project as a 2015 version rck file. Log-in to the web version and import that rck file. Edit the imported project from 2015 to 2018 and look at the results.