Horror and Ghostly Tales. Are they the same thing?
I tend, at the moment, to be writing the creepy night noise and shadow form with a somewhat uncanny similarity with some past event type stories that serve to spook the reader.
Is that different to horror?
The short answer, based on what you've described of your work there, is no; that's not any different. It's horror.
Expanding a bit, piggybacking off of William's comment, there are different types of horror stories and different types of ghost stories, obviously. For example, Dickens'
A Christmas Carol is a ghost story. But while it has its creepy moments and elements, I wouldn't say it's primarily or even secondarily concerned with scaring the reader. Conversely, one of my favorite ghost stories is H.R. Wakefield's "Used Car," which is focused primarily on building a sense of dread and anxiety over what's to come next.
There are many ways for a work to qualify for the horror genre.
Serving to scare the audience is, in my opinion, one of those ways.