Yes, you can. Resurrection will not work, but there is a new wickely overpowered spell in KBAP - Evlin. It resurrects from 10 to 30% of a slain troop (lvl 1-3), for a hefty amount of mana, but suffice it so say, that is more than enough. Sadly, this tactic suffers against mechanical enemies (they leave no corpse, which is the prerequisite for the Evlin spell) but still, playing with undead is much more easier now. In addition to that spell, Demonologists, the new unit in KBAP can easily resurrect undead through his Life Drain Ability.
Suffice it to say, playing different races is much more interesting that in was in KBTL. KBTL was biased towards humans, elves and dwarves (mostly, but not entirely, I now) - bit no longer!

In KBAP almost every race is playable. Humans with a balanced army of tanks and rangers? Elves with rangers +1 tank? Dwarves with Gants and brute force units? Undead with no-retaliation, aways regenerating units? Demons with constantly etaliating units? Pure Dragon Parites? Lizards, summoning tons of meat shield units, as well as units that everyone fears, capable of destroying 96 %of a single enemy troop if used properly?
In KBAP, everyone can have their pick of extras