That is not considered a work permit. That is a L1 visa stamp and it allows you only to work with the company that sponsored you for the visa, or another company that petitions you for the status. But you cannot just use this visa to work with any company that you want to. That is a violation of immigration
law and can cause serious problems for you in the future.
Now if you have another company that wants to sponsor you for L1 status, you don't need a new visa stamp to enter the US as long as the one you have remains valid; however your new employer must file a L1 petition the way the original employer did. Once approved, you can use the approval notice and the current, valid visa stamp to enter the US and work for the new company only. But you cannot just use this visa to enter the US and start working with any company.
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