The "audited international standards" are higher than those in the USA. This free link discusses some of the issues and you can see more by googling "audited financials to international standards". I believe Newton will need "audited financials" according to these international standards for any operating subsidiary and especially IWS and anything going on in China.
The costs for such work are going to be high as it is specialized and beyond the pale of most normal accountants specializations:
Register for free to join our community of investors and share your ideas. You will also get access to streaming quotes, interactive charts, trades, portfolio, live options flow and more tools.