yes it is. The other Wormwood book is by Ennis and it is simply called Wormwood, the Templesmith one is Wormwood: Gentleman corpse (the deluxe hc is called Wormwood : Gentleman Corpse - The First Few Pints)
HEllboydce already has it so he can probably give you more info about it (or at least about the build quality). I remember reading it years and years ago and really liked those few issues.
I recently started to develop an appetite for europian stuff and Humanoids has a lot of great looking books and while they tend to reprint oop material they also tend to reprint them in smaller size (I mean standard size, smaller compared to the ohc-s) so I figured it would worth to get the big first editions while I can. They are really good quality books.