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Yes, they are the same thing except for the physical connector.  Raymarine sells adapters. 

That is true but you give up a lot of flexibility to n what you display. The i70s is very flexible in what it can do, the i50/i60 are generally fixed function.  You can do one i50 and one i70s if you are happy with the info layout of the i50. 

You don’t, you just need a itc5 box that puts them onto the seatalkng (nmea2000) network.