Help with 415 Limit

Can someone please confirm that the 415 limit is per unrelated plan?

If someone participated in a plan for the first part of the year and maxed out their contributions at 23,000 (in 2024) and then went to another job with a 401k plan that permitted after tax contributions - with the new plan, would the participant be able to contribute a total of $69,000.  Do I have this correct?

Can anyone point me to a US Treasury Reg or IRS document that spells out that the 415 limit is per plan and not by participant?

Thanks in advance.

1.415(a)-1  and go from there?

402(g) is a "per person" limit, 415 is a "per employer" limit.