They were identical. 2000 Pro-Lite 11.1 packs. These are the black shrink covered, flat and somewhat squarish packs. There are some newer ones that are longer/narrower and are 2100 packs. Maybe that's what you are thinking of.
Here's a pic of one on DraganFly's website:
http://parts.rctoys.com/rc-toys-hobbies/Items/423211?