or in short (and off top of my head)
transmition:
they all have 6 speed box, well the LC and LCR certainly do.
engine:
power difference is mostly due to different turbo, the LCR has a Ko4 turbo the LC a K03 / K03s.
the LCR also has different compression ratio, larger air intake / Maf housing.
it also has 2 intercoolers although each are slightly smaller than the single on on the LC.
as a consequence the inlet manifold is the opposite way around between LC and LCR
suspension:
the LCR is also 15mm lower with stiffer suspension and higher damping ratio i think.
the LCR also has a lower front strut brace.
interior:
the LCR has black interior from dash up, ie roof liner etc,
the later LCR also have a nicer steering wheel with red stripe at top.
seats on LCR have 'R' on them, and option is recaro rather than leather as on the LC.
the air vents on the LCR have red lines on the horizontal adjuster.
brakes:
the brakes on the LCR are better, they have vented rears and brembo upfront.
exterior
LCR has different body kit, (front rear bumpers)
single larger exhaust tail pipe.
LCR has 18" alloys, LC 16" multi spoke and 17" split 5 spoke later on.