Angelus, are you actually arguing that the "state of grace" post-baptism is the same as post-confession? 
I am not "arguing" it, I am restating what the Council of Trent says.
State of Grace has a standard definition in Catholic theology (I am not quoting from Trent here): "Condition of a person who is free from mortal sin and pleasing to God. It is the state of being in God's friendship and the necessary condition of the soul at death in order to attain heaven."
Immediately post-baptism, the baptised is in that same kind of "state of grace." He is "free from
mortal sin and pleasing to God." And Trent Session 6, Chapter 14 calls the Sacrament of Penance "the second plank [of salvation] after the shipwreck which is the loss of grace." So both the Sacrament of Baptism and the effect of Sacramental Absolution put the soul in a "state of grace." However, the Sacrament of Baptism ALSO remits all temporal debt. While Sacramental Absolution DOES NOT remit all temporal debt.
Note that this discussion of the "second plank" is in the Session on Justification that we have been discussing regarding BoD. Both the "second plank" and BoD have the same exact effect. They "justify" the sinner. They put the soul in a "state of grace" but do not, by themselves, remit all temporal debt. Only the Sacrament of Baptism remits all temporal debt.