It would have to be a redesign, but not much of one.
I am slightly wondering about the chip dimensions. You have stated that ActiveMining chip package dimensions are going to be 11mmx11mm. However I believe bitfury chip package dimensions are 7mmx7mm. The board seems fairly tightly packed with the 7x7mm chips. If you increase the size of package you would have to decrease the number of rows and columns of chips to make them fit. So I do not understand how this could be not much of a redesign as basically everything changes.
The board is legit, it IS for bitfury chips and I know the 55nm chips will have a similar packaging.
I am also a bit wondering how you can know that 11mmx11mm chips are similar than 7mmx7mm chips?