The boundaries of these districts shall coincide with the flood boundary and floodway shown on the Flood Insurance Rate Map (FIRM) effective August 2, 2018, as may be amended, as prepared by the Federal Emergency Management Agency. No change in the boundaries of these districts shall be made unless approved by the properly designated federal agency which administers floodplain regulations. Furthermore, these zones shall be the same as those used under the administration of any Borough floodplain ordinance.