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The new skeletons have the Undead ability. Large shield. Ally protection. Stunning strike. 25% magic resistance.
Stats: 2, 6, damage 1-3, 5 HP.
Old ones: Undead. Archer.
Stats: 1, 2, damage 1-2, 5 HP.
For me, the conclusion is obvious: the old ones, in quantities of less than 200, don't represent anything, and it's much easier to start with the new ones: ranged neutrals are defeated even with fewer losses than with archers, but in the late game, you can consider switching them to archers.