Yes!

Madden 2005 has 100% support, and is virtually identical to 2006 in League Pulse's universe. The only difference between 2005 and 06 is that playbooks are set via user profiles, so they are not automated as they are in 06.

Madden 2004 does not contain Morale and NFL Icons, so Morale is exported as 100 for all player and NFL Icon status is off for all players. It also does not contain RFAs, and exporting of Hold Outs does not work. All other functionality works.