I checked and there is no code under "514512". In your case, it is the same as in your H-1B petition. NAICS code is depending on the nature of your company.
For your reference:
517310 Telecommunications Resellers
517410 Satellite Telecommunications
517510 Cable and Other Program Distribution
517910 Other Telecommunications
If your L/C is PERM, check page 1, "C", #8. It should be the same code you use for I-140.