I picked mine up in Prague a couple of months back. In LHR Sunday so happy to have a look and see if they have it.

I definitely do not have a cultured palate so better to read the online reviews of those that do, but both are 80 proof yet the Cellar 28 tastes as if it has the higher alcohol content to me, spicier, but you can still tell it is Remy Martin. Darker in the bottle too as you can hopefully see in this woefully poor photo.