SamyGO

I have a dead board BN94-02690C do you know if a BN94-02668K will work on my tv i'm not bothered about it fitting back cover

Obviously different models mainboard, can't be guaranteed, even less if design (BN41-xxxx) is different.
Check there: http://www.calpedel.it/samlst.htm
You may find much compatible references