Assuming it’s a different tube in the same machine, all the mechanics remain identical and only the power changes. After you align the mirrors, the available power will be about twice as high, so reducing the layer power settings by about 50% or increasing the layer speeds by about 100% should be close.
Of course, running new Material Tests to confirm the settings would be a Good Idea.
In earlier discussions you described the machine as having a 100 W tube: is it now working with a 40 W tube?