ok, HKS2530 and 2860/2560R spool identical (dyno lines covered each other)
the garrett has a .5mm smaller compressor wheel and different trim.
The HKS exhaust housing is very different to the Garrett. I very much doubt they are the same A/R as the garretts. You can fit two fingures into the garrett and three into the HKS. Compressor cover looks similar....only smoothed in the inlet as far as I can tell.