They have the same morale, actually...

Armoured Sarges:
Cost 540/155
Attack 7/3
Defense 14 Can upgrade to Heavy Mail
Morale 5

Italian Spear Militia:
Cost 460/125
Attack 7/3
Defense 13 Can upgrade to Partial Plate
Morale 5

Although, I notice that in custom battle they only have 2 armor upgrades. this is odd, because they only start with padded, and 2 upgrades should put them at heavy mail. But they are obviously equipped with plate with both upgrades...I don't know any unit that can skip armor upgrades...strange.