Can the social security paid by the two places be found?

It is against the labor law to pay social security in two places at the same time. If found, we need to stop one of them. If you don't find it, you can find it after retirement, and you won't get two pensions then.

When accounting for retirement benefits, the social security paid at different times and in different regions should be calculated together. If the payment is repeated within the same time period, 1 social security shall be refunded.

If the two places are insured, the payment time is not repeated, and the payment period is calculated cumulatively; If the payment time is repeated during the insured period, the individual accounts will be merged and the unit payment will be included in the overall plan, and the payment period will not be calculated repeatedly during the repeated payment period.

Further reading: How to buy insurance, which is good, and teach you how to avoid these "pits" of insurance.