Engine options for the 777-300ER: GE90-110B1 or -115B?
According to the EASA Type Certificate Data Sheet (TCDS) of the Boeing 777, only the GE90-115B engines are approved for the 777-300ER:

5. Engines:
Two (2) General Electrical GE90 Turbofan Engines
Models installed: GE90-115B,
EASA Type-Certificate No.: EASA.IM.E.002
Limitations: See Engine Data Sheet No. EASA.IM.E.002

The GE90-110B1 model is listed for the Boeing 777-200LR and 777-200F models. In the Wikipedia table, the engine entry is for all of these models together.