Dear Komandor,
You shouldn't use MissionProCombo-v4122 (or PLUS v1.0) in versions other than 4.12. It does not make any sense. When you do it, if it works, you no longer are in 4.13 or 4.14. The base code will take you back to 4.12. Porting a plane is one thing, but these kind of mods touch many integral parts of the game and can't be ported by changing a few lines of code. Functionality must be implemented into the new sources, line by line, to preserve whatever is 'new' in later versions, just like benitomuso has been doing all these past years. I only use BAT these days. BAT is the present and the future of 1946, in my opinion. There are plans to improve Mission Pro Combo PLUS but that will take time.
To answer your question: I don't know if you can use 00_MissionProCombo-v4122 in IL-2_4-14-1m_DGen_pack_3_0 but I know you shouldn't.
If you want everything there is in the IL-2 universe, including this mod, and an outstanding performance,
get BAT. If you want the features (whatever these may be) of other versions or packs, just enjoy other versions or packs as presented by their creators.
Best regards!