For mine, there was nothing more complicated than unscrewing the lens cells from the shutter and screwing them in to the db board. That said, I have not checked the cell spacing
before/after doing so, but have not seen any focus issue. You may find, on unscrewing the front element from the shutter that there is a shim to ensure correct cell spacing. I do not suggest that you transfer it to the DB , even if it is possible. I only have 3 DB boards, and none have shims. Also I have never heard of any DB needing them. In my case here was no shim between the front cell and the shutter as reportedly seen in some ( early copal?), but as it was a second hand lens , if there was one originally, it got lost before it reached me.
So to get it absolutely right you should check cell spacing against the manafacturers specs after doing the swap.
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