Here's what I understand (through Google and Wikipedia) about the whole engine-inheritance deal:
Zero Missions uses a rebuilt version of Fusion's engine.
Fusion uses a modified Wario Land 4 engine.
I don't think Wario Land 4's engine is inherited from anything.
However, Fusion was made by the same development team as Super Metroid, and it apparently resembles it a lot.
In any case, the fact that all 3 games are GBA games pretty much says that it's very unlikely the ROM is structured similarly, let alone similarly enough to only have to tweak these programs. However, another program that rips the graphics from one of the games could maybe be modified to work with the others.
Also looking forward to tomorrow, which is possibly tonight my time.
Zero Missions uses a rebuilt version of Fusion's engine.
Fusion uses a modified Wario Land 4 engine.
I don't think Wario Land 4's engine is inherited from anything.
However, Fusion was made by the same development team as Super Metroid, and it apparently resembles it a lot.
In any case, the fact that all 3 games are GBA games pretty much says that it's very unlikely the ROM is structured similarly, let alone similarly enough to only have to tweak these programs. However, another program that rips the graphics from one of the games could maybe be modified to work with the others.
Also looking forward to tomorrow, which is possibly tonight my time.