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No, the SD80MAC was built on proven 710 engine components.  What wasn't proven then or now is the electronics in the 70-90 series, hence the upgrades, and the newer ACe cab, ugly as it is, is already built to accept the new electrical cabinets and such that will be installed.  Curiously enough though, some of the Kansas City Southern SD70MAC units are being upgraded but keeping their original cab.   I wonder how different if any the KCS upgrades are VS. the NS upgrades.  I expect ALL of the NS EMD DC to AC and AC upgrade locos to get the ACe cab. 

I remember when Conrail got their first SD80s. I have a photo I took of two sitting east of the Conway yards.  I guess  NS got the SD90s from Conrail at the merger. They were and still are in the 7200 series.  At first they kept then close to Altoona and were using them on coal drags on the South Fork secondary.  I have tons of video and stills of them up there. My favorite still has to be the SD40-2, though.

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