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In short, is it more like 93 octane versus 87 octane, or like gasoline versus diesel?
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Different to both.
At bottom, it's about electrons and the holes where electrons aren't. Each cell chemistry has characteristics like voltage, current, sag, etc. The cells are arrayed in batteries. The battery in turn has an operating voltage range, power capacity, etc. The chargers, controllers and inverters will have their own characteristics.
Bucking and boosting means you can delver higher or lower voltages than the source. You can mix and match OEM components within reason. With CAN bus messaging.
Edit: I just discovered the EVTV Friday Show Index. Here's the episode where they talk about salvaging the battery pack out of a Kia Soul (best power density going). It's going to power a Tesla motor in an AC Cobra.
EVtv The "Friday Show" Index: January 29, 2016