explain why two soils forming in the same climate under similar vegetation might still end up with quite different horizons and other characteristics.

Answer:Explained below

Explanation:

Factors affecting soil formation are

Climate Parent Material Topography Biological Factors Time

so the soil Forming under similar vegetation might end up with quite different horizons and other characteristics because with different parent bedrock and biological factors they may end up with different characteristic.

Also time taken by them during soil formation might be different so it could also causes different horizons and characteristics.