Find replace aircraft database rows from another file

findreplace.py

import csv

with open('aircraft.csv', 'r', newline='') as db_csvfile:
  db_reader = csv.reader(db_csvfile, delimiter = ';')
  db_data = list(db_reader)

  with open('replacements.csv', 'r', newline='') as replacements_csvfile:
    replacements_reader = csv.reader(replacements_csvfile, delimiter = ';')
    replacements_data = list(replacements_reader)

    for row in replacements_data:
      hex_to_replace = row[0]
      print("Finding hex " + hex_to_replace)
      for db_row in db_data:
        if hex_to_replace in db_row[0]:
          print("Matched hex!")
          db_row = row

  replacements_csvfile.close()
db_csvfile.close()

print("Writing new list...")

with open('aircraft.csv', 'w', newline='') as db_newcsvfile:
  db_new = csv.writer(db_newcsvfile, delimiter = ';')
  for row in db_data:
    db_new.writerow(row)
db_newcsvfile.close()