In the final round of Imdaar, do the winners need to use both new ships in their list or cant hey only use one?

My understanding is you have to use both of the new ships

Have to use both

http://www.fantasyflightgames.com/edge_news.asp?eidn=4776

One player will construct an Imperial squad that fields both the TIE defender and TIE phantom. The other will construct a Rebel squad that utilizes the Z-95 Headhunter as well as the E-wing. Both players will complete their 100-point squadrons by adding starships and upgrades from their existing X-Wing collections. Then, they’ll face off in a heated duel for the fate of the galaxy!

In the final round of Imdaar, do the winners need to use both new ships in their list or cant hey only use one?

All 4 ships will be seen.

Yes the four ships you need to use, but you could complete the points of the squadron with the rest of the ships, greettings.