Suppose that a junior and senior mining company have entered into a joint venture for a project. Suppose that the junior has access to feasibility studies prepared for the senior miner. NI 43-101 obligates the junior miner to file technical reports. Management at the junior should be disclosing material information to shareholders anyways so they should be issuing technical reports even without 43-101.
The easiest and cheapest way for the junior to meet its obligations under 43-101 is to re-purpose the technical reports prepared for the senior miner. However, many technical report authors hired by juniors choose to heavily modify the work given to them. The technical report prepared for the junior will change the underlying assumptions. In my opinion, the simplest and best explanation for this behaviour is that the junior is trying to inflate the technical report. They are likely pressuring the technical report author into manufacturing higher numbers.
This is one of the reasons why I dislike the junior mining world. Juniors are generally dishonest and extremely difficult to perform due diligence on.