Is this the same resolution basically as having the same amount of particles roughly overall when you go flip fluid object grid scale at 1.5 and particle separation at 0.015 vs grid scale 2 and particle separation 0.01 ?
no, not the same amount of particles overall, not the same amount per voxel, not even the same grid resolution
grid scale is just the multiplier of the particle separation to define the grid resolution in each axis
- psep .015 and gridscale 1.5 will have voxel size .0225, roughly 3.375 particles/voxel or 300000 particles/unit3
- psep .01 and gridscale 2 will have voxel size .02, roughly 8 particles/voxel or 1000000 particles/unit3
what exactly are you trying to find out? the question is not very clear