Status of previous LCA after LCA certified for new location

[vkg2414]

My h1b was approved in Nov 2013 for location X. But the client had no active assignments so I moved to another project in the same company. Now LCA was certified for new client new location. But since amendment is required in my case the client does not want me as it will take time. In the meanwhile the previous client from where petition was files, asked me to come back. Is the original LCA with which my petition was filed, still valid? Or do I again have to get it certified? Pls guide.