ET3D: Weird. What I'd suggest is that you contact Amazon. In my experience Amazon support is good, and perhaps they'd be able to shed some light on this. It does look like the publisher of the two versions is different, and that likely explains why one is available to you and the other one isn't.
Amazon's support is usually excellent but I know what their answer would be: a digital distribution rights related issue.
Andanzas: I live in Spain and From Hell is similarly invisible to me in Comixology; it never shows up in sales or in my searches. But I purchased it a while back from amazon.es and it transfered to Comixology with no problems when I linked my accounts.
I
think that option isn't available to me. In lack of a .pt Amazon, .com is
my Amazon as far as digital contents are concerned. At least, that was the case when I wanted to buy a Kindle ebook reader and had to order one from the US.
Andanzas: Great book, by the way.
*sigh* Yeah, I've heard nothing but good things about it...