Johannes Andersen for Hans Bech?  

There is a dining suite that Johannes Andersen designed for Hans Bech that is on the Danish furniture index. This is the table. I have never even seen the matching chairs in photos, and I've seen the sideboard with an arc shaped base in photos once. So these pieces are quite rare, and I suspect nobody know the answer you are looking for.
If I were you, I would start looking for little details about the two pieces and see if they match up. The same manufacturer will use the same hardware, jigs, etc. Maybe look and see if the both have identical glides? Check the thicknesses of the legs. Check the radius of the curve between the horizontal and vertical parts of the leg. Check how the legs attach to the rest of the piece (this might reasonably differ).
If you can match these sorts of things up, you probably know what the answer will be, and you can go looking for the sort of proof that does not require hours of study to recognize.
I would b curious to see photos of all this, as I really like these pieces in photographs and would be curious to learn more about them.

You could also compare details like the drawer construction and other inside bits to the photos of the documented Hans Bech sideboard. That would offer a wealth of detail to compare.

Here is one to compare:
http://www.pamono.com/hb20-danish-rosewood-credenza-by-johannes-andersen...
And another:
http://www.lauritz.com/en/auction/johannes-andersen-rosewood-sideboard-h...

Thanks, i will definitely look into that! As far as know and Remember the legs are pretty much identical.
I took a look on the sideboards(the teak one that you linked) and their drawers looks pretty much alike.

Take photos of the side of both drawers. That is the comparison you want.