Default Porting Kitkat 4.4 to a 4.2 base?

Hi.
Sorry if my thread seems noobish, but I'm not really proficient in making roms, programming, coding etc.
But how difficult is it to port a 4.4 rom to a 4.2 base?
I have an Ulephone P6 (mtk 6582, 720x1280, 1/8 Gb) and it runs a 4.2 stock. Since not so long ago there appeared a 4.4 update rom for Lenovo s930 which is almost simmilar to my phone except some slight features, and it has the same kernel in both 4.2 and 4.4 roms - it is a 3.4.5 kernel. My phone has a 3.4.5 kernel and pretty close specs, so I'm wondering if I could make a port rom from lenovo's without any specific troubles - I mean assembling/deassembling and so on?
Can anyone give some pro-advice or point to a descent tutorial? I have already read some threads about making ports, but still it is not clear if I can just use the simple "copy-paste" method or is there a deep hell of work and it is not so easy?
Thanks.