Everything is the same. Just make sure when you are getting engine parts, they are for the Duratec and not the Zetec. Anf if you get a short throw shifter, that its the 2002.5+ model.
Most parts say 2000-2003, just because the catalogs haven't been updated.
2003 Ford Focus ZX3 2.3l N/A = 221 HP, 162 ft-lbs, firstname.lastname@example.orgMPH - SOLD
2006 Ford Fusion 2.3l Turbo = 244HP, 247ft-lbs
2016 Ford Fusion Hybrid