I need to replace a EM-HDA-8FXS module on a 2821 router and it had a EVM-HD-8FXS/DID module, that is replaced by EM3-HDA-8FXS/DID. I was wondering if the EM-HDA-8FXS daughtercard module would work with the EM3-HDA-8FXS/DID expansion module. thanks...