I thought I would add my two cents worth to this particular thread. Back in 2015 - 2017 I was fortunate to be able to obtain several 8oz bags of Penzance through pipeandleaf.com and always had a full supply of it on hand.
I can say beyond a shadow of a doubt that it quickly became (and still is) my all time favorite tobacco. One of it's distinctive characteristics was it's creaminess.
Since Penzance has gone the way of the dinosaurs, I live with what I can get. I've read with interest the previous threads similar along with this one as well.
I always keep a good stock of G.L. Pease Quiet Nights and Seattle Pipe Cub Plum Pudding Special Reserve.
My opinion is that Penzance was Penzance and nothing comes close.
I like Quiet Nights And Plum Pudding but they are in no way similar to Penzance. I guess you can pretend it is, and attempt to trick your palette into thinking so, but when the dust settles them is them and Penzance is, well, Penzance. Lancer Slices are good as well but I've never found any of these particular blends to be remotely like Penzance. Don't get me wrong, please. I love those three tobaccos very much and they are also in my weekly rotation.
If someone were to ask me for closest match, I would say Esoterica Margate which I still have in good supply.
Will I ever obtain or taste Penzance again? I don't know and I really don't care. I quit chasing tobacco fads a few years back.
Anyway, that's my take on the whole 'most like Penzance question.'