payback.ie

Those differences are due to the way the rounding works. The P35 report rounds down the figures to the nearest Euro for each employee.
Using the P35 Breakdown report, the tax from the P35 is 10477. If you include the cents for all payments, it is 10482.44

For the totals at the bottom, each employee's tax and prsi is rounded down and totalled. The P35 report does not have cent for each employee
Eg, for two employees

Tax PRSI
Emp1 5530.56 2402.23
Emp2 2023.40 1032.89

Rounded:
Tax PRSI
Emp1 5530 2402
Emp2 2023 1032

Totalled:
Tax PRSI
7553 3434


The P30 cent amounts are not rounded in this way, so they'll be larger values.