I would agree with MT Sourdough, One has a smaller nose profile but smaller grease grooves, the other more of a bore riding nose profile but larger grease grooves. Likely they equal out and weight the same.
It could have just been rolling around on the floor for a couple months. :biggrin:
I have a some 437 gr bullets that were cast with the same WW+2% alloy, but one batch spent 13 months in a metal strainer, constantly getting kicked around on the floor and having stuff piled on top of them.
That 'abuse' batch looks like absolute crap and is slightly oxidized, giving the appearance of pure lead or close to it; while the rest of the bullets look nice and shiny like they were cast with straight linotype. ...But, of course, they're the same thing, that just experienced different 'storage' conditions.
You guys are good! they are very close to the same weight. In the first post, the bullet on the left isn't but a year old, the one on the right is close to 12 years old, both are very close to the same hardness. In the pic below the older bullet is on the left.