Re: same weight/ same POI ?
The answer is that the trajectories are different.
The question is whether or not it's significant for your situation.
Here's an example based on 2 factory loads...
Federal Gold Medal: 308 Win 168g Sierra MatchKing BTHP
BC=.463
2650fps, 10mph wind from 3 o'clock
100yds, elev=0, windage=.75
300yds, elev=4.75, windage=2.25
500yds, elev=11.75, windage=4.25
700yds, elev=21, windage=6.50
Federal Gold Medal: 308 Win 175g Sierra MatchKing BTHP
BC=.513
2600fps, 10mph wind from 3 o'clock
100yds, elev=0, windage=.75
300yds, elev=5, windage=2.25
500yds, elev=12, windage=3.75
700yds, elev=20.75, windage=5.75
