You may have just bought the last box of one production run, and the first box of the next production run.
When I was goat culling full time Federal changed from their own Hi-Shok projectile to Sierra Pro-Hunter to Speer Hot-Cor in their blue box .25/06 117 gr. ammo. Had to do a quick zero adjustment on a forestry skid one morning.
Highland/PPU changed from a stubbier 100 gr. projectile seated deep to a long ogive design seated further out.
I like to buy factory ammo by the 200 case and check zero when open each new case. Trouble free motoring from then on!
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