If you do bother sharpening it, that’s gonna likely also throw it a bit off balance too, so make a point to check its center balance as you sharpen. Whichever blade ends up heavier, well just grind a bit more off of the end of that blade until it basically balances out, otherwise your mower will be louder and under way more stress, causing other parts to wear out faster.

But hey, I’m assuming you have your own grinder, so if I were you, I’d go ahead and try sharpening first before bothering with a new blade.