Status of old lca when new is certified

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 Y. 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 filed, 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