Thats exactly right !
The H&R's , which are a direct fit, are ment for a 33 which has higher dishes on the front shock absorbers.
Think about it this way: If you take stock 33 springs and stock Sud springs, the Sud's will be higher and stiffer.
So if you put stock 33 springs on stock Sud shock absrorbers, the car will lower about 25mm but it will be softer - which is not good for the handling of the Sud.
Moreover if you put performance lowering springs of the 33 - like the H&R's on the stock shock absorbers of the Sud and keeping the lower deeper dishes of the Sud, you will end up with a stiffer progressive setup , but the car will lower another 35 mm - total of almost 60mm ! - which will look ridiculous as the rear end of the car will look like an offroader !
So , in other words, the best setup is:
H&R's lowering kit of the 33 on stock sud shock absorbers, but with the lower dishes of the 33 instead of the Sud, so the spring will sit a bit higher and help you keep the balance right
Hope this helps