This page details one or more prototype versions of Apocalypse II.
The 1994 build of Apocalypse II is, surprisingly, near-identical to the 1997 one. The only differences are that the later build replaces the Psygnosis credits with ones for the developer.
Easily the more elaborate change.
"PSYGNOSIS 1994" was changed to "TEPCO 1997", and the copyright symbol was shifted a bit to the right.