Is there any reason that I shouldn't use prefab pavers for concrete?

Hello. I am wanting to have concrete countertops in our outdoor kitchen, and I was thinking of using large sidewalk pavers for a shortcut, as well as avoiding some of the expense of custom countertops. I was thinking that I should be able to sand stain and seal these the same as you would after a custom pour. Is there any reason I should not use these prefab pavers for this purpose?
thanks for your input.
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