Yes, the Octavia is the same as Golf, A3 Leon and so on.
The TT arms do fit to an Octavia. No question.
But: the TT bracket don't. The TT brackets have a different shape.
If you want to fit TT arms to an Octavia you have to reuse the
original Octavia's brackets (or the Whiteline ALK) as you have to on
Golf or Leon.
So the Whiteline ALK does not fit the TT.