That part is a consequential amendment, so it's not really part of the bill. It's just modifying some wording, because Bill C-42 creates a new commission. That part, which is called the ship-rider part, was already adopted by Parliament in Bill C-38, so this is already law. Bill C-42 is just making some consequential amendments.
To address your second issue on joint investigation cross-border, maybe you can find your answer at section 45.95. I can read the first paragraph, “If a complaint concerns the conduct of a designated officer,” for example an RCMP officer who is working cross-border with the FBI, or DEA, or cross-border law enforcement—an American officer—the new commission created by Bill C-42 may “conduct an investigation, review or hearing of that complaint jointly with an authority that is responsible for investigations, reviews or hearings with respect to complaints from the public against law enforcement officers in any relevant jurisdiction, whether in or outside Canada.”