I think how similar the two surgeries are really depends on where the meningioma is. For my AN, they didn't know if it was an AN or a mening until they "got in there". Either way it was a big cerebellopontine angle tumor, so the approach didn't matter for the tumor type. The thing they told me was that the AN was the "better case scenario" (like there can really be one, right?) since it's less likely to grow back.
If your friend's tumor is in the CPA then probably a lot of the info here will still be applicable!