It is hard to be 100% from the photos but they do look a lot like they belong to a release of Pizzazz. I am not as certain as you are that they are definitely first year pumps, as there are a number of variations on her first year shoes depending on the type of doll/place of manufacture/distribution...and the second year shoes don't look so very different either, since 2nd year Misfits basically have the same outfit as first year ones.
I can't get at my first/second edition Pizzazz dolls at the moment to check what's on their feet. You're probably already aware of Prance's site but she has some pictures and comparisons...
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visitors can't see pics , please
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The first year variation shoes are easy to spot, and mostly show up in the UK and Europe with "NC" or ballwristed dolls. But there are both first year dolls made in HK and China without ballwrists as well as the second year releases. So lots of minor detail variations mean that it might be hard to make an exact match to which release. Hopefully the above images will help...
In any case, and at the very least, I think they belong to Pizzazz.