Sud front springs are longer. Sud spring pans are deeper to accomodate the longer spring.
Are your current 33 front strutpan bearings metal or plastic? If they are plastic you are using the later struts, if they are metal, they are the early type, what strutpans are on the sud, there are 2 types and 2 types of metal bearings.
One type the pans sit ontop of the bearing, the other type the pan hole is larger and the bearing sticks through it.
If the pans on the sud are deep and sit ontop of the bearing, they will fit on the later plastic bearings on your 33, I have never seen these though, the deep pans seem to be the ones with a larger hole where the bearing goes through it.
The metal bearings will not fit on a later type 33 strut that uses a plastic bearing!
I once used this combo on my ser 2 33 to get a 60mm drop at the front.
Early type 33 struts with the metal roller bearings, I have both types and then fitted the sud spring pan with a deeper drop and the 33 springs. You end up with about 4 degrees of -ve camber though
Hope that helps and I was clear
What are you trying to achieve?