You’re far better off just using levels.fyi which is pretty accurate for big companies like Apple. According to levels ICT4 varies from 260k to 440k which I’m willing to bet is a narrower band than anything Apple will provide.
Information from the business itself is more reliable than information from a third party website. It is also more useful to the business’s existing employees.
Also, the third party website can use the information from official job listings to provide the most accurate and sourced data.