NEC ECC: Option B. is Contractor entitled to direct fee on substituted work in the BOQ, as the original work had already included the P&G's?

If there was an item in the BOQ for supply and install swing gate, and the contractor priced for this item, now the Employer is changing the swing gate to sliding gate, do we still have to pay for Subcontractor's fee as the initial swing gate already had an install fee?