NJ501: I think quite similar since its just a re-transfusion of your own blood.
It isn't the same.
When you get an autologous transfusion, where you have pre-donated your own blood, you get your blood back. Simple. Give. Store. Give. Store. And maybe give again. Store. Transfuse same blood back into patient. (or not). This type of blood transfusion is straightforward but isn't used much - it was popular back in the early days of the HIV/Aids scare. However, the administrative burden added substantial cost to this method of donating. And, not everyone is a candidate for this type of specialized service. But, it can be done and still is in some cases.
Cell salvage is quite different than that. In cell salvage, the shed blood from a surgical site is suctioned up and put into a canister to be processed and cleaned. And, then the packed red cells that are left are re-tranfused into the patient. The filtration process strips away platelets and other components of the blood that are needed for coagulation. The only part of the blood that a patient gets returned to them is the oxygen-carrying cells - the packed red cells.
And, it is by examining that process, cell salvage and filtration/processing, that a person begins to understand why the JWs are allowed those "minor" fractions of blood.
However, the WT never does explain how that "pouring on the ground" part of the bible verse applies in the use of cell salvage machines.
This court case describes a cell salvage procedure being used during a surgery:
http://caselaw.findlaw.com/pa-superior-court/1868129.html