TPPC VS PPC

IN EOC Q CFAI has used total PPC and PPC interchangeably. What is the correct definition/formulaes for this . Please discuss separately IFRS/GAAP

Tx in advance

Same thing.

Pension expense, on the other hand, is different.

Is both TPPC and ppc are affected by employers Contributions? TPPC =ppc =contribution -(ending funded status -beginning funded status) is this correct Does the pension expense include what is reported under oci? Or only the IS IMPACT? Tx