Attached Link: ActionStorm

does it work for v3 too?

While I often use poses made for one figure on other figures, I do not recommend it unless you do not mind tweaking your pose a bit after you apply it.  Because of the difference in how V4 and V3 joints and body parts are set up, the V4 will not apply the same to V3.  It will get you close, but you would have to do some manual adjusting of the V3 figure after applying the pose in most cases.  Usually this is only a very small amount of adjusting but some poses will require more and some will require little or none.  A lot will depend on how closely the rotation of body parts affected in the two figures match each other.  One simple trick that helps between the two figures is to lock the feet and toes on V3, and apply the V4 pose, and then unlock and manually pose the V3 feet/toes as needed - if needed.  Fingers can also sometimes cause problems.  Most everything else will work fairly well.  V3 has a buttocks group and V4 does not but both have thigh groups so the legs generally pose fairly close.  The collar groups differ in set up too but do not seem to cause too much problems when sharing poses.   Mostly I find it is the feet and fingers. 

Please let me know if you have any other questions.  I am always glad to try to answer if I can.

Rob