Those are not the same class of sub. The Los Angeles class is not a Seawolf class. Although the Seawolf class did replace the Los Angeles class. Unless you know of a current Replacement for SNN -688 Los Angeles decommission in 2011 that is a Seawolf class.
You are correct. What I meant to say was:
Seawolf-class submarines length: 108 meters
Seawolf-class USS Jimmy Carter length: 138 meters
difference: 30 meters
And USS Jimmy Carter is certainly a Seawolf-class submarine.