When it comes to Donkey Kong..

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Putin said:

umm, what additional gameplay elements TF have?

You know, first level of DKC had few hidden levels(screens) being shorter in lenght than first level in TF(but there you can find maybe 2 at most). You could change your monkey instead of using only Big one, you could ride a rhino, you could use that rino to find new hidden levels, those levels where not only about "get all bananas". You could even drop a barrel at some point to reveal another hidden thing. In the next level you run in the Jungle at night in a storm, which ended at the end of the level.

In TF, first 3 levels that I played, same scenery, same platforming, same hidden level, and nothing new.

In TF you can do more than in DKC1. 

You have four characters instead of two. 3D sections. Rocket Barrel levels. Destructible (and vastly more dynamic) environments (without needing a conveniently placed barrel to break them) often hiding secrets.

Play the whole game, then compare them.