Can we fix Cyanogenmod12(cm12) bugs with the help of cyanogenmod11(cm11)?

I have been practicing c,c++,java,php,html since 5 years now i am making android apps its been 5 months doing that.I also have been rooting android devices and flashing custom roms since 2 years now I want to get my hands into porting Custom Roms for various devices. Since I dont know anything so I just want to know about how can I do this. Well making a complete rom will be not possible way to learn completely at once this is what I think. But now I am having two custom roms Cyanogenmod11 and Cyanogenmod12 for a low end device named Samsung galaxy fame gt-s6812 somebody has ported these roms for this device.Now, cm11 is working really very fine but cm12 having lot of bugs : 1.Microphone not working 2.Speaker not working 3.Unkown Baseband and IMEI number etc. I just thought that by just replacing some of the things like folders or files from cm11 to cm12 will work for this. Because many people are porting roms by just copying folders from one into another.

If this can be happened then which folders will get me rid of these bugs. Please help me out Links , explanations, videos anything which can give knowledge about all these stuffs. Thank you