All of the lovely acronyms have little difference between each. Teaching English as a Foreign Language or English as a Second Language, apply the same pedagogical methods.
It is assumed that Chinese students already speak Chinese. Therefore English is a Second Language. Just as those who speak English might consider Russian a Second Language.
Perhaps you have not been in the field very long but just as there are differences in requirements within China there also exist vast differences in most countries. ESL is somewhat unique in the requirement of "native speaker" because students do need to "hear" the language properly spoken. You chose Filipino as an example. There are many Filipinos who may understand and beable to converse in English but very few who can pronounce properly or use grammar correctly. Therefore I would say that most Filipinos would not be considered for teaching ESL in China or other asian nations.
Just as a point of interest, what is your native country and how long have you been a qualified teacher?