Are Tohoku dashi and Korean dashi related? Which one originated earlier?

The northeast big sauce is generally in the rural areas of the basic household will be under the general from the production to eat about half a year or so, to fermentation, it is very laborious. The color and consistency will be different because everyone under the sauce of different crafts and there is a difference, delicious sauce is generally yellow, not delicious, some answer black, Korean sauce only bought in the supermarket, I feel that the taste and the Northeast sauce and a lot of difference in taste, the modern approach is certainly not as good as the old way to do it out of the delicious.