phpmyadmin import

I have two mysql db's on a hosted linux site, "db1" and "db2".  They are both Tikiwiki MySql DB's.  I have used phpmyadmin to "export" download db1.   I want to "import" db1 to overwrite db2.  I select db2 in my phymyadmin control panel, then Import > Browse to db1 > GO.   I get the message below.

What else might I do to upload and overwrite db2 with db1?

Error
SQL query: 
 
--
-- Dumping data for table `tiki_actionlog`
--
INSERT INTO `tiki_actionlog` ( `actionId` , `action` , `lastModif` , `object` , blah blah blah
 
MySQL said:  
 
#1062 - Duplicate entry '1' for key 1

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