No - there is not any lever compatibility between Code and Maven. If a Code blade is installed on a Maven lever, it could lead to system closure. This is a critical safety concern, and thus we do not approve the use of Code blades with a Maven lever.
If system closure occurs, the high-pressure system is isolated from the reservoir. This would result in the brake not being able to manage any system expansion that may occur.
The Maven Tuning Kit allows you to install the Maven B1 carbon lever blade and SwingLink on Maven A1 SLV and ULT. You can find more information here: Is the Maven Lever Tuning Kit backward compatible with all SRAM Mavens?