Actually they are the same thing. It is called dark field live blood cell analysis.
I think there is a lot of hype surrounding the procedure, and I have seen this used too often as a sales tool. This is leading to people being mislead as to what the findings are and what they really mean in an attempt to sell supplements. As an example one company I saw was using this to sell enzymes. They would take the blood sample and show people how the red blood cells in the sample would clump. Mostly in a condition known as rouleaux, which means pile of coins. They would then have the people take some enzymes then come back a half an hour later and the process was repeated. This time the cells would not be clumped. The problem is that the clumping is not from an enzyme deficiency as they are claiming. Rouleaux can be caused from too much sodium, lack of oxygen, infection, inflammation, cancer, etc. The enzymes do help break up the protein bonds that help hold the cells together, but again the problem is not from an enzyme deficiency. And the enzymes could prevent a proper diagnosis as the rouleaux is not seen when the blood is examined by legitimate labs. This could prevent other conditions contributing to the rouleaux from being discovered. So I was not very happy with the companies sales technique.
In another case a lady who manufactures a oral chlorine product was also using live blood cell analysis to promote her products at large meetings. She would broadcast the images on to a large screen so everyone could see, then would point to white blood cells calling them parasites.
I think the technique could be helpful for finding certain blood conditions if in the hands of someone that really knows what they are doing. Unfortuneatley most of the people buying these microscopes are not properly trained with them and are just using them as sales tools.