Quarterbacks
In both 2002 and 2003, Daunte Culpepper ranked first and Peyton Manning ranked second. That's the only time since 1970 that the same two QBs have ranked in the top two spots in consecutive years. Trent Green ranked 3rd in 2002 and 4th in 2003, so only Donovan McNabb's 3rd place ranking in 2003 prevented the trio from holding on to the top three spots.
No other time was very close, except all of the top 6 QBs in 1978 ranked in the top 8 in 1979.
Running Backs
Three times the top two RBs in one year ranked in the top two the next. In 1978, Walter Payton ranked first and Earl Campbell second; the two flip-flopped in 1979. In 1990, Barry Sanders and Thurman Thomas (Go Cowboys!) ranked first and second; in 1991, they finished in the same order. Those were the middle two years of a four year run where Thomas was the number two fantasy RB; now we know where the Bills got that idea from

. More memorably, in 1999 and 2000 Edgerrin James and Marshall Faulk ranked first and second, with James being the main man in 1999 (by a single point) and Faulk leading everyone by a mile in 2000.
Something else interesting happened those two years; Eddie George ranked 3rd in both 1999 and 2000. That was the only time the same three RBs ranked in the top three in consecutive years. In both 1976 and 1995, the top four RBs ranked 1st, 3rd, 4th and 6th the prior year, but there has never been a quarter to hold steady over consecutive years.
Wide Receiver
There has been a WR quarter to do that, though. In 1992, Sharpe, Rice, Irvin and Rison were the big four; the 5th WR (Anthony Miller) was 30 points behind Rison. In 1993, Rice, Rison, Sharpe and Irvin ranked 1-4, with the 5th best WR (Carter and Tim Brown, tied) 15 points back of Irvin.
In 2001, Harrison and Owens ranked 1st and 2nd; in 2002, Harrison and Owens ranked 1st and 2nd. In 1999, Harrison ranked 1st and Moss 2nd; in 2000, Moss ranked 1st and Harrison 2nd. Those are the only two times the same two WRs ranked 1st and 2nd in consecutive years (it didn't even happen in 1992/1993). The same trio has never ranked 1-3 in consecutive years, either. The top five WRs have never repeated, but that 1992/1993 group was extremely close: Anthony Miller (ranked 5th in 1992) was only three points away from ranking 5th again in 1993.
Tight Ends
As noted earlier, the same two TEs have NEVER ranked at the top in consecutive years. That's easy to remember at least: 0 TE pairs, 1 QB pair, 2 WR pairs and 3 RB pairs have ranked at the top in consecutive years. The same trio has never ranked at the top consecutively, either, but there were two close calls: In 1996, Sharpe, Walls and Coates ranked 1-2-3; they ranked 1-4-2 in 1997, with Rickey Dudley edging Walls for third place that year.
1990 was even closer. In 1989, Rodney Holman, Keith Jackson and Brent Jones ranked 1-2-3. In 1990, Brent Jones and Keith Jackson ranked 1st and 2nd. Jay Novacek ranked 3rd, beating out Holman by
one yard.
No quartet of TEs ever remained on top, and no quintet did either. But the same six TEs ranked in the top 6 in 1993 and 1994, and the same seven TEs ranked in the top 7 in 1993 and 1994. In 1993, Sharpe, Green, Coates, Mitchell, Jackson, Jones and Metzelaars were the top 7, and in 1994 the top 7 were Coates, Sharpe, Jones, Jackson, Mitchell, Green, Metzelaars. The 8th best TE in 1993 was Jackie Harris, and he ranked 18th in 1994. The 8th best TE in 1994 was Wesley Walls, who ranked 77th in 1993.