We know of at least two different bootlegs of the Space LP.
The first version, released in 1995, is only distinguishable upon closer inspection. Some of the elements on the back cover look like they have been cut out from the original artwork, then pasted onto a black background.
The second version is actually easier to tell apart from the original due to its stamped runout groove and the omission of the barcode on the back cover.
There are two different CD bootlegs as well. The manufacturers tried to duplicate the Space CD identically, and apart from a slightly botched print job almost managed. Both versions are easily recognisable though, for a large black area after the phonograph right and copyright symbols and before the words “MADE IN ENGLAND”, whereas the original KLF Communications release says “1990 KLF COMMUNICATIONS” in that area.
The CD itself is distinguishable because of the “fake” compact disc logo and the fact that the text that runs along the edges of the CD is only on the top, as opposed to being on the top and bottom of the original.