Chanter Pet vs. Necro Pet?

[Ruinous]

I'm leveling a necro with a friend of mine who plays an enchanter. We are both currently level 16. I've noticed that with every new spell level, his pet is always hitting for harder than my skeleton. This doesn't seem accurate to me, anyone verify if that's how it was or not?

Our 16 pet spells for example:

My max level summon seems to hit for 18 at most and double attack.
His always comes out hitting for 20 and double attacks.

It's been like this every spell level so far. His always comes out ahead of mine on damage somehow. I've also noticed that giving my skeleton a rusty 2-hander actually reduced his DMG at lower levels, whereas it significantly boosted the chanter's pet.

Didn't want to post this in bugs because I am not sure that it is one.