How would Lexington-class carriers change if the battlecruisers were designed as American versions of HMS Hood?
Short answerThey would be somewhat larger carriers with better subdivision and survivability.
NotesThe Lexington battlecruiser concept prioritized scouting and economic warfare over fighting other battlecruisers. A design closer to HMS Hood would put more protection and subdivision into the hull from the outset. It would be somewhat heavier and probably larger. Those structural differences would survive conversion into an aircraft carrier and improve its ability to withstand damage.