The reason you may want to update to a newer version of anything is the take advantage of fixes and implementation of newer functionality and for databases possibly standards. Review the information from the supplier about what is changed if the version.
Depending upon how you have split your database (the are different methods), it is usually replacing the hsqldb and sqltool jar files. Again depending on the split method, these files may be in the
That answers the actual question.
As for your reasoning, have seen nothing to indicate this would create a connection problem. Have used many different versions and don’t recall any problems in this regard. Go back to the original post on this and note the split method used. It would also help if you post a copy of one of the standalone forms you are having problems with.