curious about front and rear sight differences

[crowtalks]

One of my Garands has what appears to be checkering on the rear peep and the front sight blade walls are straight...while the other one has a smoother surface on the face of the peep and a curved front sight walls.

I know these are minor details, but I have a great curiosity about details, and I haven't really been able to find much info on this.

Any info is greatly welcomed.

Jim