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You should create dblink between db1 and db2.
IN PR1 you can use like this
BEGIN
.
PR2_procdure@db_link_name(param1);
END;
My preference would be to create the database link, then create a synonym for the procedure on the 'remote' database.
That way, if the 'remote' database changes, you simply need to create the database link to the new target and change the synonym without having to amend any code calling the 'remote' procedure.
This is, of course, most beneficial if the 'remote' procedure is called from multiple pieces of code.