Leopardwood is generally much more dense and heavier than lacewood.  I have leopardwood in my shop that has small fleck in the grain, honestly about the size of a pin head.  I have another piece of leopardwood that has long stripes of fleck that are 1/4" wide by about 2 1/2" long.  You really can't go by the size of the fleck in the grain.  The lacewood I bought years ago did have more of a pink tint to the fleck in the grain, where leopardwood has more of a tan color in the fleck.  Leopardwood also generally has somewhat of a waxy feel to it.  Lacewood when turned will be almost a powder rather than a fine chip like leopardwood.  Hope this helps a bit.