All 1999 Mustangs got the same badges except for the Cobra....same in 2004 with the 40th anniversary edition. Every Mustang that year except the cobra got the 40th badges.
A true 99 anniversary car is different. it has a hood and side scoop later used on the 2001 mustang, a different spoiler, blacked out trim between the taillights, blacked out hood decal, machine finished wheels with black inserts, and different interior features such as the only 99+ to have true black interior i beleive. They only came in silver, black, white and red
They are rare, so worth a little more, but not much
Here's a 35th anniversay car