Question about Microsoft 365 Family Deutsch

That is a very good and justified question. I asked myself the same question - and found no answer. If you take a closer look, Microsoft's product codes are also different.
In addition, it is extremely difficult to find out exactly what is actually in the product. Outlook, for example, is not included everywhere. Another complicating factor is that Microsoft changes the names of its products every few weeks.
I therefore contacted Microsoft on the corresponding Office (or whatever it is called) for a chat and received very friendly and detailed information. A plus for Microsoft. Really.

Quintessence: The Family things (with Outlook) are all the same. Ditto for the Singles.
Just buy the cheapest one.