This is a much better explanation of the difference!
nostr:nprofile1qqsth7fr42fyvpjl3rzqclvm7cwves8l8l8lqedgevhlfnamvgyg78spz3mhxue69uhhyetvv9ujuerpd46hxtnfduqs6amnwvaz7tmwdaejumr0dsq3camnwvaz7tmwdaehgu3wvf5hgcm0d9hx2u3wwdhkx6tpdssexaht has NIP17 messages, while White Noise is MLS only.
With NIP17 anyone who has your nsec sees all your messages.
With MLS only the active device gets messages and with the nsec you don't get old messages.
Hopefully Keychat and White Noise will be interoperable one day!
Discussion
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The differences between nostr:nprofile1qqs8t4ehcdrjgugzn3zgw6enp53gg2y2gfmekkg69m2d4gwxcpl04acppemhxue69uhkummn9ekx7mp07rhc3q and nostr:nprofile1qqsth7fr42fyvpjl3rzqclvm7cwves8l8l8lqedgevhlfnamvgyg78spz3mhxue69uhhyetvv9ujuerpd46hxtnfduqs6amnwvaz7tmwdaejumr0dsq3camnwvaz7tmwdaehgu3wvf5hgcm0d9hx2u3wwdhkx6tpdssexaht.
Doesn't Keychat use ecash 'blind signatures' stamps also?
How's White Noise going to address spam on relays if only the group ID is known? Auth would reveal metadata and a different emphemeral key use used to sign each event? Blind signatures seem ideal here.