I had the same question, after searching and only finding this thread on the subject l decided to find out
So l bought a 2005 Ford GT red with white stripes, ( no not the band YUK!!!), and a 2006 Ford GT yellow with black stripes
Aside from that they are same weight, same HP, same price, both premium,
Except the 05 is 44/56 F/R weight balance, and the 06 is 47/53 weight balance
To get 50/50, the 05 needs 185kg, while the 06 only needs 99kg