Sorry - the fireworks at the parks are most definitely NOT the same as other nights. At all three parks they are different. Last NYE we were at EPCOT. Illuminations ran at 9:00 PM and then again at 11:40, which was the start of the NYE fireworks. They continued around from pavilion to pavilion, following the time zones until the three North American pavilions (Canada, Mexico and the US) all exploded at the stroke of midnight. It was wonderful.
They also run a huge fireworks show at the MK (hint - they do a dress rehearsal of it on 12/30 at midnight, even including a countdown) and it was great.
The parks are jammed - but we loved spending NYE at EPCOT and would do it again.