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This may have been due to the arena not being finished in time for the kiosk demo.
The fight takes place in Jungle Japes, rather than Crystal Caves. Squawks' text is different and much more generic. After successfully completing the minigame, the HUD is shown and it looks somewhat different: the Golden Banana count is shown as a vertical column of banana symbols, and the counter at the bottom uses a banana group symbol rather than a single banana as in the final. With the rather strict coin requirement, this makes the minigame very, very difficult. This is the mine cart minigame in Jungle Japes, with the difference being that you have to collect 70 coins, as opposed to 50 in the final. Chunky's animation for when he's carrying the TNT barrel is slightly different. Chunky has an extra punch attack after doing his standard punch twice that was removed in the final. After Dogadon is killed and the key appears, the boss music continues to play rather than the victory music. It was thankfully toned down in the final, though the original sound can still be heard when the llama splits at lava in Angry Aztec. Dogadon's sound when he spits fireballs sounds pretty hideous. There is no light source near Chunky during the intro cutscene, making him harder to see against the background.
Rareware may have chosen these events to make the game more exciting and appealing to potential customers. The choice of events is very odd, as they're nearly unwinnable for a novice.
After completing an event, the game cuts to an "Available Christmas 99" screen, and eventually loops back to the intro, where you'll then be able to play the next event. The demo contains three playable portions of the game: the second Dogadon fight, a harder version of the Jungle Japes mine cart minigame, and the second Army Dillo fight.