This info was sent to me by Antz who worked on the artwork for both releases, as well as recreating the album covers during Earache's re-issue period.
This is what was sent to me...
"The cover for LaHiD isn't the same place as the cover for the SoLaH album. I know they look similar but the shots were both taken by different photographers and in different places. The second shot was sourced because it looked like the first but more doomy. The cross in the first cover was digitally moved on the cover to make a better image and on the second one the sky was enhanced to make it more interesting. Originally the cover of the second album was going to be the same as the first but with an effect like tracing paper down the right hand side with the new title on but in the end Justin and I decided to come up with a different idea. Having the digipack format as the main CD format on the second CD took a lot of persuading with Earache as it was more expensive than a normal case.
One final peice of information about some of the early covers you might like to know. The artwork for all the early albums was lost years ago and when Earache in the UK came to rerelease them about three years ago all the CD packaging had to be recreated. A lot of it from scratch. If you look at new copies of the CD you'll find small differences to the originals."