@steelcat,
If you're trying to connote a similarity in terms of how two separate entities look (specifically), as a native English speaker, I'd find it most natural-sounding and clear in terms of meaning to say:
1) A and B resemble each other
2) A and B look alike
I would not find it natural to say: 'A is as B' or readily grasp the fact that you're comparing their outward appearance if you said either that or 'A is like B'.