the difference is that windsor is built on a 90nm architecture and the brisbane is built on the newer 65nm architecture. i suggest you get a brisbane instead because it draws less power and has a better architecture than its windsor counterpart.
Your fried cpu is an Athlon 64 X2 5200+. As Carlhenry mention, brisbanes are manufactured with the 65nm process compared to the 90nm used on the Windsors. The Brisbanes also have half the cache of a Windsor which causes them to perform slightly worse clock for clock, but not something noticeable.
That being said, an Athlon 64 X2 6000 Brisbane would do nicely but a Athlon 64 X2 6400+ Windsor would perform slightly better.