Nope
There are cultural differences within Somalia.
For example, the way people behave with in-laws etc. For example where I am from, it is ceeb for the girl's father to stay at her house for days. But it is okay for a father to stay at his sons house for however long he wants, as his sons money is his money. But I heard among some Southern Somali circles, they don't care.
This is just one example.
We have always had cultural differences, the same way we have linguistic differences.
Also, some things have been adopted through intermarriage and migration. For example, Buranbur is originally from Bari, but now all Somalis do it, even though you can see the variations even in the way they read the buranbur or the dance adaptions.
Dirac, I think from Djibouti.
Etc.etc.