Get rid of the old ones, yes.
Old shaders folders kr_shader 11.29 [c]] and ... [nc]] contained much more files than shadercache folder though.
For examle new folder ending with ShaderCache\ShaderCache-PC-D3D-SM3-DongHae_ChungGak_B01_P.upk
while old folder has same and many more until ShaderCache-PC-D3D-SM3-Yugachon_P.upk.
Just doublechecking that we really should get rid of old ones... Thx