I have a standard horizon cmp25w mike at the helm. The connector terminal plug is damaged. It may be 30 yrs old. So I searched for replacement. The only model. that comes up is a cm31w. So 2 questions; does a. cmp31 versus cmp25 matter? And will the precise same terminal pin configuration and communication voltages be correctly compatible. So essentially plug and play? Thanks for your help here. I have a 35 C & C wintered in Manitowoc, WI