LU,
It’s not the same as other pas haboh b’kisnin, because it is a shailoh whether they are actually pas haboh b’kisnin at all, or if they are just like regular mezonos (e.g. pasta). Therefore even if you eat the shiur, whereas with pas haboh b’kisnin you certainly have to bentch, with sufganiyot there’s a safeik if you should bench.