Can we say, that, the B777-200 LR is in fact the same aeroplane as the B777-300 ER (same dimensions etc), ....

Question

..... but can just fly longer?

(so has just more place for fuel, and less for passengers)?

Answer 1

No, the -300ER has a longer body.  The wing is very similar though, so the -200LR can fly farther.

Answer 2

Yeah the same planes except for longer wings and more auxillary fuel tanks to carry more fuel which gives it the longer range.

Answer 3

The -300ER is 33 feet longer and thats a big difference even in the airliners standards. The other major difference is the powerplants installed. The LR's MTOW is 4 tonnes lesser than the ER.

So same family but different airplanes.

Answer 4

The 777-300ER has a longer fuselage than the 777-200LR, so the dimensions aren't the same.  

But other than that, the 777-300ER is for carrying many passengers over long distances, the 777-200LR is for carrying fewer passengers over even longer distances.

Answer 5

The -300ER is much longer than the -200LR and has a distinctive swept back "wing end" (located on the usual "wing tip" part, although I know it has no wing tips) on its wings. It is also Boeing's competitor to Airbus' A340-600, which is currently the longest passenger aircraft.

Answer 6

The planes can't be the same, if they were Boeing wouldn't give them two different names.