At least in Europe, there were two different releases of the CD-ROM edition (not counting the budget releases). The first one came in the same box as the floppy disk release, with a "CD-ROM" sticker added to distinguish it from the floppy-based version. It included the speech pack, but was the same otherwise.
The second version had a redesigned box and was released in 1995. Unlike the first CD-ROM edition, this one was fully patched to fix all the bugs and plot holes that the game originally had.