one thing that I have found is that the existing 4 bolt holes in the mount will be close enough to the new pattern that the holes partially overlap or are so close that the 8 bolts (4 in mount & 4 for dome) interfere with each other.
Yes-you can avoid this by making a thick enough adapter plate to countersink flathead bolts,etc,etc,but that often ends up more work
than removing & correcting the stand.
Check the 2 bolt patterns first to see if the above will happen.
Otherwise,I can't think of any other reason.
My personal experience & humble opinions-feel free to ignore both
Remember-If all else fails, Google is your friend.