Both the free pack and the cost pack have the same cards, just more in the bigger pack. All have G1 box art.

Only difference is the back of the cards, freebies say 17... Cost say 30... (As seen in above pic of the cost pack)

Characters are:

Both packs:
Optimus Prime
Megatron
Laser beak
Jazz
Ironhide
Hound
Grimlock
Grapple
Frenzy
Cliff jumper
Bumblebee
Blue streak
Ratchet
Ravage
Shockwave
Sound wave
Stars cream

30 pack:
Astrotrain
Barrage
Blitzwing
Brawn
Cosmos
Devastator
Huffer
Ransack
Seaspray
Skywarp
Thundercracker
Topspin
Windcharger