c70 replacement

[wieltom@yahoo.com]

my C70 screen fades out, or doesn't always come on, but sometimes works perfectly, so from reading other forums I take it that that unit is failing. everything else works great, radar , gps, depth. can I replace it with a c80, c120 etc. by just pluging it in as the back of those units looks the same? I understand the e series would require additional equiptment??