It follows reference design for power phases which is 13+3 (same for MSI Ventus). The FE is a custom card with better than reference design using 15+3 phases.
That's the only difference and AIB partners likely didn't know what the FE would look like anyway. They just tiered their products from reference as base and then upwards.
That's the only difference and AIB partners likely didn't know what the FE would look like anyway. They just tiered their products from reference as base and then upwards.