Both the Bacterial RC and PSII transfer 2 electrons from a dimer of chlorophyll molecules (P680, P960) to a quinone when 2 photons are absorbed.  The electron transfer pathway through the two is basically the same starting with a dimer of chlorophylls, then a pheophytin, then two quinones.  In both the donor special pair is reoxidized between photons.  In the RC the source of electrons is 2xCyt c₂²⁺ which transfer the electrons through the C subunit (Cyt  c₂²⁺ produced  when the Cytochrome bf complex accepts the  electrons from quinol) while in PS II the electrons are extracted from H₂O at the Mn₄ site. There is significant homology in the core subunits that bind the special pair, pheophytin  and quinones.