When the rules changed, the acronym changed. They actually mean the same thing TDP=CDP
The old rules used LDP and so do the new rules.
This illustrates rule three of The Governing Rules:
1) Acronyms shall be used to obscure reality.
2) The best acronym shall have the worst technical justification.
3) When you need to look as if you have done something profound, rehash an old thing to make a new acronym