You can do it this way:
In your PhpMyadmin, select your Mambo database and point your table to mos_users. On the SQl tab you can copy and paste your sql with the below pattern:
INSERT INTO `mos_users` (`id`, `name`, `username`, `email`, `password`, `usertype`, `block`, `sendEmail`, `gid`, `registerDate`, `lastvisitDate`, `activation`, `params`) VALUES
(68, 'juan delacruz', 'juan', 'juan@email.com', 'e10adc5949ba59abbe56e057f20f883e', '', 0, 0, 29, '2005-08-23 16:16:37', '2005-09-07 16:12:41', '', ''),
(69, 'pedro penduko', 'pedro', 'pedro@email.com', 'e10a6c3949ba59abbe56e057f20f883e', '', 0, 0, 18, '2005-09-25 18:13:10', '2005-09-25 18:13:38', '', '');
Ofcourse the above infos are jsut examples. Do not forget to backup your database first before doing anything.