Compared with Mate 40's Kirin 9000, which is manufactured by TSMC in TW. The Mate 60's Kirin 9000S is manufactured in CN. Almost safe to say it's SMIC 7 nm process. As for numbers like 2031, 2035, it's a number representing the year and week of year the chip is produced. For Mate 40's Kirin 9000, it was produced in week 31 of 2020. For Mate 60's Kirin 9000S, is it produced in week 35 of 2020? No, that's the first week the US ban of fab manufacturing chip for Huawei came into effect. In short, it's the timestamp of the US ban.

More chips are found with the number 2035-CN, signifying these chips are banned by the US. LOL.