A new version of the blood card was published in June 2001. The cards were shipped to some congregations and probably a few were actually distributed to members who were baptized over the summer and fall in congregations that ran out of the older version.
A few months later congregations were informed not to distribute these new cards, but rather destroy them. The difference is one line where the older March - 1999 card states "I direct that no blood transfusion (whole blood, red cells, white cells, platelets or blood plasma) be given to me...," the June - 2001 version reads "I direct that no allogeneic blood transfusion (whole blood, red cells, white cells, platelets or blood plasma) be given to me..." So the difference in the cards is the use of the word allogeneic in the June 2001 version.
An "allogeneic" transfusion is one derived from the blood of a different person. The implication here is clear. The Watchtower Society stood at the threshold of permitting autologous whole blood transfusions (transfusions of one's own blood) and for some reason, presently unknown, suddenly shifted and stepped back.
..... Any who are still convinced that the WTS stands solidly behind this policy and are prepared to die defending the policy (or even worse - permit their children to die) have cause to soberly reflect on their support.
This may be one of those situations where the governing body voted to permit Jehovah's Witnesses to use their own blood and put the wheels in motion to change the policy - only to have one member of the body change their mind at the last second and call for a re-vote.
http://www.watchtowerinformationservice.org/bloodcard.htm