Not really.
All 777-200ERs are technically 777-200s as the ER is a company designation and not an official Boeing variant. Both have B772 as their ICAO.
However, the 777-300ER is a separate aircraft developed from the 777-300 with various improvements on top of an increased range. The 777-300ER has B77W as its ICAO while it’s B773 for the 777-300.
Temperature is subjective, so one could consider snow hot
Except… they’re not
Otherwise that’d be the same as calling an A350-900ULR simply an A350-900
I guess the same is true for the A350-900ULR then
99% of people that don’t like aviation: can’t we just call it a 777?
nO iTs An A319
No, it’s a Cessna 172.
No, it’s a Boeing AF482
Woah, that Embraer 747 out there looks so big!
edited 
But it just technically is. It is the same platform, but modified.
I will defend the fact that it is not a mortal sin to call a 777-300ER a 777-300.
my zombo com transcript 
what’s more, is u actually used capital letters there 
i copy and pasted the script of the best website in the world
new wfc rebranding leaked
copyright striked by zombo
nah the website was untouched since 1999 i don’t think anyone cares
