The head-to-head record for Nepal (Nep) vs Hong Kong (HK) is not provided in the given evidence. The evidence only mentions that 274 climbers scaled Mount Everest in a single day from the Nepali side, but it does not contain any information about the head-to-head record between Nepal and Hong Kong.
The evidence does not provide any details about the teams or countries competing against each other in the context of Mount Everest climbing. It only focuses on the record of climbers scaling the mountain from the Nepali side.
Since the evidence does not contain any information about the head-to-head record between Nepal and Hong Kong, it is not possible to provide a factual answer to this question based on the given source.