Trading Lexington for Courageous and Glorious

Which carrier classes would the Royal Navy and US Navy gain most by trading?

A Courageous-and-Glorious for Lexington-and-Saratoga exchange could teach the United States earlier lessons about small carriers while giving Britain more formidable fleet carriers.

Most cruiser exchanges would benefit one navy more than the other because both sides still needed their own ships. The deliberately asymmetric alternative is a carrier trade: Courageous and Glorious for Lexington and Saratoga. Operating the smaller British conversions could teach the United States early that such ships imposed important limits as fleet carriers. That experience might discourage later attempts to turn undersized hulls into substitutes for full fleet carriers. Britain would gain two large, fast carriers with eight-inch guns, giving the Royal Navy more formidable aviation platforms in the early war. Their visible fighting power might even make Scharnhorst and Gneisenau more cautious during the Norwegian campaign. Each navy gains a different lesson rather than simply swapping equal specifications.