Hi there.
There is a difference between the 777 (non ER) and 773 both in seats and configuration.
All the 777 (TG`s name for the 200`s) are in 2-2-2 configuration and the 773 are in the (at least for me) dreaded 2-3-2 configuration.
The 773`s (77R) does however have the third generation TG business class seat (same as the 777-200ER) with a much larger IFE screen and feels (IMO) more comfortable than the older seats^
The 77J (Jet AC) flies to CDG and NRT.
Cheers