the major difference between Lx470 and cygnus is... lz470 has laser welding....
other than that all the vehicles of Lexus brand are available with Toyota for different markets. However Lexus being elite from toyota does carry something that those toyota tag doesn't got.
LC100..... 4.2, diesel, 4.7 petrol [usually 5 seats]
LC100... Cygnus... 4.7 petrol, more options from and rear facelift i guess...[7 seats]
LX470... same as cygnus, except the laser welding
The Lexus package indicates, logos [all areas except steering wheel]
the Cygnus version is available only in RHD to my understanding.