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When you purchase an EC2 Instance Savings Plan, you're essentially committing to a certain usage level (measured in $/hour) rather than to the use of specific instance types. This commitment allows you to receive a discount on your compute usage.
If you've made an all-upfront payment, the amount you've paid is based on the usage level you've committed to. If you switch to a cheaper instance type within the family, you won't get a refund for the difference. Instead, the savings plan could apply to more hours of usage. Conversely, if you switch to a more expensive type, your savings plan could cover less usage, and you would pay on-demand rates once your committed usage is exceeded.
So, in essence, your all-upfront payment is a commitment to a certain usage level, not to a specific instance type, and changing instance types within the family doesn't result in a refund or require an additional upfront payment. You just get more or less coverage of your usage based on the cost of the instances you're running.
You can read how Savings Plans work here: Savings Plans FAQ
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