I'm confused about those two terms, but based on my understanding articulatory gestures are represented by the vocal tract variables and articulatory features include all units are involved in articulation, such as dental, lips, apical, etc. Also, the vocal tract variables can produce the articulatory features based on a certain model:
|Vocal Tract Variables (articulatory gestures) | ---(MODEL)----> | Articulatory features|
Is that correct so far?