The "Article" module framework makes it pretty simple for cloning a module.

To make a clone

Step #1: change all template file names under /templates/ and /templates/blocks/ starting with "[i]article[/i]" (new module dirname). For example, change [i]article[/i]_index.html to [b]newarticle[/b]_index.html

Step #2: edit file "include/vars.php", set the value for $GLOBALS["ART_DB_PREFIX"], for say, "[b]artdb[/b]"

Step #3: edit all mysql files under /sql/, change prefix value of all tables to the specified value "[b]artdb[/b]". For example, change "CREATE TABLE `[i]art[/i]_article`" to "CREATE TABLE `[b]artdb[/b]_article`"

Step #4: install the cloned module as regular