Looking for an exterior facade. Concrete with a matrix or clinker?

Clinker/bricks. Or clinker slips.

But since they are from Holland, I would want to exclude slips. Clinker in light gray is available like sand by the sea from all kinds of manufacturers - whether you find the identical manufacturer is hard to say, as you would then have to look and search across the border.

we are urgently looking for the facade attached. Can someone tell us how this was made or is it possibly clinker? Our architect suspects "concrete cast with a matrix"

I completely agree with that.