In which direction? Remember, the A15 was designed as a "big" core while the A53 was considered a "LITTLE", having a design lineage closer to the A7.
Correction, Jetson Nano has Quad-core ARM A57@1.43 GHZ. They are the Big cores of most big/LITTLE configuration with better L1/L2 cache(48KB/2MB unified in case of Nano) than A53 cores.