Actually, there were two different models...
The original B32-8 were three test/demonstrator units, GE-owned but painted in BN green, built in 1984 (since retired and I think scrapped). These had the original Dash-8 styling: curved cab roof, very "busy" long hood appearance (with step in the side like Dash-7 units).
The later B32-8/Dash-8 32B built in 1989 (45 for NS, 1 GE test/demonstrator unit) had the cleaned-up styling introduced (on the B39-8E) in late 1986: flat-topped cab, no step in hood side (new, air-cooled, air compressor eliminated the motove for it), grid below radiator wingspan slanting out.
The Amtrak B32-WH is different again. It has the same 12-cylinder engine, in a wide-nose ("W") carbody similar to that on the ATSF B40-8W (a bit longer than the earlier B32-8, to accommodate head-end power equipment -- "H" -- and allow proper weight distribution), but with a strange, curve-sided, very small fuel tank.
(When GE announced the Dash-8 line, there was a "B23-8" listed: none were ever built.)