

https://dcyf.wa.gov/safety/mandated-reporter
Washington’s list of mandatory reporters, lawyer is not on there.
https://www.law.cornell.edu/wex/attorney-client_privilege
Attorney client privilege only faulters when you disclose you plan to continue committing a crime or are planning on commiting one. Or in some cases where a protective order or custody order is violated and only the lawyer and client are privileged to the child’s whereabouts. https://www.casemine.com/judgement/us/5914c52eadd7b049347d2545
What you tell a lawyer is confidential bar some rare exceptions. If you attain a lawyer and tell them you have commited the crime of child abuse they do not have to report unless you divulge a plan to continue abusing children. When you attain a priest during confession, you also have this confidentiality.
Theologically, a priest breaking the seal of confession is a grave sin and warrants immediate excommunication. No priest is risking this to out someone during confession.