The Webster's dictionary you mentioned should be the original version, and the target audience is English-speaking learners, mainly Americans and Canadians, so Webster's dictionary series is adopted.

The Webster's Advanced English Dictionary you mentioned should be a cooperative version with domestic publishing houses, which is suitable for English learners in Chinese mainland. Phonetic symbols should be specially modified for mainlanders. I have never used this dictionary, so it may not be KK phonetic alphabet or Webster phonetic alphabet. Is it an international phonetic symbol?