They are similar but not the same. The Concentree is MUCH more herbal, almost to the point of being "dirty". While I like it, I can't wear it in the heat, unlike its older brother, and have relegated it to winter wear. The original is airier, with a more noticeable verbena note, which is one of my favorite aspects of the scent. I prefer the original by far. To sum up, the notes are very similar, but the emphasis on them is much different. If you are as familiar with the original as you say, you should be able to tell the difference without much trouble.