This is not that hard. Schock is the boat building company. They built several lines
of boats; Schock, Santana and Wavelength to name a few in much the same way that Pearson built Ensigns, Tritons and Vanguards or Beneteau builds Oceanis, Idylle and Firsts. Santanas were generally the more hardcore race boats. The original Snad Turner designed Santana 35 was an IOR influenced out and out race boat. You could rightly call these boats Schock Santana 35''s in much the same way that you can call a Vanguard a Pearson Vanguard. In its original form the Santana 35 was extremely light for its day, (8500 lbs) and lightly ballasted. They came with a fractional rig
and a great racing cockpit. Ergonomically these were great boats to race. Build quality was something less than top notch. While they were not ideal offshore boats for a lot of reasons they have done well racing in windy venues and Francis Stokes raced one single-handed in the Ostar transatlantic race in the late 1970''s. The Santana 35 became a successful West Coast one design class.
The Schock 35 was an updated version of the Santana 35 which uses the same hull and a slightly altered deck mold. In much the same way as the J-35 was a masthead non-rule based version of the J-36, the Schock 35 had a little nicer interior, a masthead rig
, a different internal structure and much more ballast and weight. Similar to the Santana 35 there is a separate active West Coast one design class for the Schock 35''s. The Schock 35 with its higher stability and larger sail plan is generally considered to be significantly faster than the Santana 35 but in many areas of the country the Santana 35 has an easier time sailing to its more generous PHRF rating.
The Schock 34 PC was intended to be a Performance Cruiser although I believe that there are also full race versions of this design. They are a later design than the Schock 35 and were intended to be more cruising oriented. They had a jazzier interior layout and a slightly better build quality than the 35''s. They were comparatively lightly ballasted for their heft and sail area. The Schock 34 PC''s were substanially slower than the Schock 35''s and slightly slower then the Sanatana 35''s.