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If you're attempting to simulate the Tabata protocol all exercises should be equally hard. That's the purpose of it, to put you right at the edge of failure and keep you there. You should be about to hurl by the end or it ain't Tabata.
I'd adjust the time for other exercises. The 20/10 protocol isn't special and was specifically for doing a stationary bike.
Sprints are a perfect example where you must adjust the timing as you can't sprint all out for that long. The goal is a max effort you can sustain for the whole sprint, not max then petering out for a good part of it.
I've done Tabata on a bike, and Tabata like intervals with sprints, burpees and kettlebells (both with swings and snatches). Sprints need to have shorter work periods, burpees felt about right to me and kettlebells worked the best for me with approx 30 second work periods. Of course, with k'bells the weight you use is a huge factor and you could try adjusting that instead.
bruce is right. If done correctly, and assuming all exercises are the same 20/10 duration, nothing can equal the workload of all-out sprints. I've done Tabata-everything and while they're all very difficult, full out 100% Tabata sprints are by far the most grueling. I wish I had a video of my first interval versus the last one...would probably look like a completely different person in the matter of 4 minutes.