Samsung Rom Marshmallow/Oreo - can I use different file types?

Ive been doing some reading on creating your own rom using samsung stock. What im wanting to do is use the system.img from marshmallow, and combine that with the rest from oreo (to get around the downgrade disable). Knox is already tripped i dont care about that...

both roms have the 5 tar.md5 files when extracted, AP, BL, CP, CSC and home CSC - however, to extract those once again, marshmallow contains regular disk image files, .img while oreo contains bin.lz4

Can I either, leave these different compression styles within the tar.md5 files, replacing the oreo system.bin.lz4 with the system.img from marshmallow, compress back into the tar.md5 and try flashing. Or, is there some clearcut way to convert either the bin.lz4 into .img , or the other way around? Has anyone done this before?

I was able to extract the bin.lz4 using diskinternals linux reader which produces a single file, simply labelled as "file" under the file type (windows 10). but what i cant figure out is if that is correct, and if so how to turn it into a regular .img file. the file sizes, between the bin.lz4 and the "file" ones are the same, which makes me suspect that this isnt correct. 7zip wont open the lz4 files at all.

Id love some advice from here. I know this is alot of work just to downgrade, but I am determined. Id love to figure this out! It would be my own personal way of saying "screw you" to samsung for locking things down so hard... also Im looking for that full touchwiz experience, for anyone whos about to suggest a custom rom. maybe its "chunky" but i love it.

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