Noticeable differences--check the review.
These two products made for an interesting comparison, as one is marketed as a highlighter and one as a blush. Personally, I found that I could use both products as a blush/highlight combo and not need to use another blush or highlighter with either of them. In doing so, I found I could achieve the same look with both of these products - with some work. The Charlotte Tilbury product is simple to use, and absolutely gorgeous on the skin. I found it easiest to just dot the product directly onto my cheek and then blend a bit with a stippling brush. It gave my cheekbones a nice lift, and a pretty peachy-pink blush glow. It worked with multiple foundations (powder and liquid) as well as bare skin and had great staying power.The elf product is fussier - it comes in a pot, and the best way I found to apply it was to tap a VERY small amount onto my cheeks with my finger and then blend it with a damp sponge, working quickly. This product is more color than glow (where the CT is the opposite) so definitely start with a small amount and build up as needed. While a bit trickier, I had the same experience with the elf - worked with all my base products and lasted throughout the day with no problems. I'm not sure that I would call this elf blush a dupe for the Charlotte Tilbury, simply because the application is just so much more difficult. The best part about the high-end product here is the ease of application. However, if you're looking to try out a dewy blush look, you can absolutely achieve that with the elf blush - for $32 less!