Old Pulteney 12 yr old vs Old Pulteney Navigator

In my first effort at a comparative self-whisky-tasting* I can report, direct from Pulteneytown, that I can distinctly tell the difference between a glass of Old Pulteney 12 year old and Old Pulteney Navigator, but the differentiation becomes less distinct as the glasses empty. I fear I may even have muddled them up; or perhaps they have muddled me.

* Why must everyone, at the moment, be in self-isolation? Is isolation less effective if unadorned by prefix?