From what I could tell, the area the 4 bottom radials bolt on the main section looks like the plate is a thinner piece and theres only 1 hole for the radials to be bolted on there....
I have one of the old ones on the back porch, and it has the 2 holes for the bolts...and this plate is also thicker on mine...
I don't know how you tell if its thicker or thinner just by looking at my pics?