Is mou of another employer consider valid evident by labour court ,against workman

Dear Sir , Suppose " A " is a employee , and terminated by his employer termed here as " B " Now A has complain in labour court against B but meanwhile ,during proceeding , more than one year spent , and now "A " has got another job in different employer termed here " C" Between A and C a MOU has signed which indicate that professional catagory of employee. Now my question is , that . - Is this MOU (between A and C ) may be produce in court by B , to prove that employee was not a workman as mentioned complain by A in labour court Is this MOU will be consider valid document against A by Labour Court Please advice ----