Khamzat round 1-2 finish, probably on the ground. Ddp has been taken down and put in compromising positions on the ground against far lesser wrestlers (Brunson). He also tripped himself into full mount vs Tavares. Khamzat has far better control and is far more dangerous than someone like Brunson.
Ddps style of striking, where he often overextends, will also open him up to getting taken down against a really strong wrestler.
If it goes to the later rounds, sure, DDP has finishing ability and can't be counted out. His cardio is underrated, but we've seen him slowed down too in sequences, before finding a second wind. Similar to Khamzat, he gets too much criticism for not dominating every round, but they can both still be effective and dangerous whole exhausted.
I give DDP a punchers chance, 70-30ish Khamzat.
We also haven't seen anyone dominating him like Khamzat vs Usman round 1 or Khamzat Rob round 1. If he survives something like that, they will BOTH be tired.