Isthiaque bhai never will i try to compare your knowledge to mine when it comes to cars since you are WAY ahead of me but if you don't mind, i'd like to point one little thing out. Defenders came into being in around the late 90's. before that they were series land rovers or 90's and 110's. the actual "defender" name is new so technically very few defenders are rusting away in garages.
Also the Land Rover V8 does indeed have it's origins in a Gm/buick V8 but alot of time has passed since then and those blocks haev even been used in TVR (though they are a little long in the tooth now).
so we chould only compare the "defender 110" to an LC both on and off road. also if we are going to be comparing a japan built LC to a defender 110 TD5 or a tomb raider V8.