What is difference between

These terms are often used interchangeably. Audit procedures are anything the auditor does as part of the audit. Certainly audit tests are a type of audit procedure. I suppose that, for example, asking for a letter of representation is a procedure not a test, though the letter itself is audit evidence.

Tests of control test if controls have ben carried out. Eg, look at supplier invoices to see if the account to which they have been coded has been authorised. Authorisation is a control.

A substantive procedure wouls be to reperform some of the encoding to ensure it is correct.