  We study the Anderson single-level quantum dot attached to two BCS
superconducting leads with the same gap size. We reveal that a system with
asymmetric tunnel coupling to the leads ($\Gamma_{L}\neq\Gamma_{R}$) can be
related to the symmetric system with the same net coupling strength
$\Gamma=\Gamma_{L}+\Gamma_{R}$. Surprisingly, it is the symmetric case which is
the most general, meaning that all physical quantities in case of asymmetric
coupling are fully determined by the symmetric ones. We give ready-to-use
conversion formulas for the $0-\pi$ phase transition boundary, on-dot
quantities, and the Josephson current, and illustrate them on the NRG results
of Oguri, Tanaka and Bauer [Phys. Rev. B 87, 075432 (2013)] for the
three-terminal setup. We apply our theory to the recent $0-\pi$ transition
measurement of Delagrange et al. [Phys. Rev. B 93, 196437 (2016)] and determine
the asymmetry of the experimental setup from the measured transition width.
Finally, we establish that the widely assumed Kondo "universality" of physical
quantities depending only on the ratio of the Kondo temperature and the
superconducting gap $T_{K}/\Delta$ cannot hold for asymmetric junctions.
