Op Khukri was the best Op conducted by Para SF. But, like you said, 20 years ago. Things have changed now. We borrowed RAF transport aircraft at the time. And, the rebels weren't capable of shooting down a chopper, which made CAS viable. (Mi 25).Where does Operation Khukri rank among these? That was conducted 20 years ago by Para SF.
As for comparing it to the ops by USSOCOM in Syria, Khukri wasn't a raid on an enemy position. It was a Hostage rescue operation. Different beast. Cannot be compared. Still, one fine op. But, it couldn't be done with the same tech today.
If they had to conduct an op with as much complexity today, I don't think they could, as they are behind on technology. Even terrorists have jammers, basic comint capability, and means to take out aircraft. More importantly, they are better trained. We have to upgrade our tech, especially in terms of Comm equipment.. And Night fighting capability, ballistic protection, etc.