The main difference is that the HoodieCarrier 2 is an all-in-one solution (without accessories) with a width-adjustable seat for the infant's pelvic distance and a height-adjustable center section for the child's height (as on the HoodieCarrier).
These are therefore two different but equally physiological solutions for carrying from 0 to 36 months.
With the HoodieCarrier 2, you also have the option of attaching the straps under the buttocks to better keep his position rolled up and his limbs bunched together. The loops prevent contact with baby's leg.