since Celia and others covered the rest pretty well.
Clothing/immersion gear will be a difference. Since you are often in direct contact with the water, you will probably have this on already.
Judgement of conditions and skills are something all of us need to have a steady awareness of since they vary considerably over time. What you learn about judgement for powered craft bears little resemblance to what you will learn over time/practice in your kayak. Kayaks, for example, spend lots of time in surf conditions, something most powered craft, for obvious reasons, try really hard to avoid.
Recreational Kayak Paddle
Rescue / Throw Bags
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