If they are the original alloy wheel fitting nuts, then as mr.singh
rightly says, you can use them.
As per a response to you in a similar post you put up, do check for
'sufficient' clearance if fitting 15" wheels (for winter) to you Brab.
The front disks and calipers are larger on a Brab. If necessary you
may just get away with using thin 5mm spacers to enable clearance.
And...the point about checking with your insurers is also correct as
I am not aware of the 15" wheels being an 'option fit' on the Brabus.
TO CLARIFY...(for anyone interested)
You cannot use alloy fitting wheel nuts with steel wheels, and
NEITHER can you use plain steel nuts to fit alloy wheels.