Grass is aliased on one terrain but isn't on the other

I have two terrains with identical settings, only a different heightmap. I also have the exact same sprite imported as a grass texture for both terrains, and imported with the exact same settings for both terrains. Now, for some reason the grass appears to be incredibly aliased on my second terrain, while it is fine on my first one. Here's a comparison screenshot:

I am really unsure how to proceed next. The aliasing on the second terrain's grass makes it practically unplayable as it looks even more horrible in Play mode and the first terrain isn't enough to make for a full game... All I can assure you is that both terrains have absolutely identical settings and both of them use the same grass sprite with the same import settings (size, color, everything)!