In short, it is the knight title of 400 ounces of gold bars with 99.5% purity stored in the underground vault of the City of London. London gold in a broad sense refers to all the spot gold traded.
In fact, for example, a piece of gold placed in London is called London gold. Put it in Zurich. It's called Zurich Gold. In new york, it is called new york Gold. It's just a geographical difference.
Their quotations are definitely the same, but the quotations you mentioned are different, or the quotation platforms or units are different. But the trend is the same.
After 1974, the Hong Kong government lifted the gold import ban, and international gold merchants flocked to Hong Kong, using Hong Kong as the second-hand market for trading. Since 1975, Hong Kong's gold market has gradually taken shape, and now it has become one of the four largest gold markets in the world. The so-called LOCO LONDON actually refers to London settlement, but because LOCO is similar to local pronunciation, it is misunderstood as local London gold.