@Mercy They seem like completely different products to me.
Known is a CMS which allows you to own your data, then publish and syndicate it to multiple platforms (including uploading to Anchor). It doesn't have any audio creation or editing functionality. I have seen people using this and WordPress lately for small personal microcast "channels" which can be subscribed to or syndicated out to other social platforms.
Anchor appears to have some production and publishing tools as well as a distribution platform of sorts. It looks like the material you publish to your own station can be listened to for 24 hours, but then disappears unless you archive it to your account privately. Fortunately you can export your audio with a little bit of gymnastics, but it's not intuitive. This seems more like an ephemeral audio version of snapchat to me.
I'm curious what you're looking for in a minipodcast? I'm considering something shortly myself and have been looking at Anchor as well as Opinion2, Spreaker Studio, audioBoom, tryca.st, and even others as simple as using my LiveScribe Echo pen to record and then distribute via my Known or WordPress sites.