Read what he says on page 128 in his epic
Napoleon's Mercenaries - where he discusses this topic
Klicki joined the staff of Eugene's 4th corps (also according to Dempsey)
I cannot find him however in the detailed OdB of Marco - Staint Hillaire's Campagne de Russie 1812 page 384
Malibran Chelminski lists 7e CL - ex Vistula legion - in an OdB on page 107 as being part of 4th corps