I don't think Nichols (batting) is a 350/460 card.
Cards were likely swapped out during the print process so some sheets may be identical in configuration but for one or two cards, giving different/odd brand numbers. Below is a basic example of this.
If you had a sheet of 34 (including Nichols) used for the 350 series you would get 34 Drums.
Then Nichols gets swapped out for a new card (Downey Batting) and that new sheet is still used for the 350 & 460 series. We would then have the original 34 Drums + 1 new Drum (Downey) giving 35 Drums.
Now for the 460 series the new sheet of 34 with Downey could have been used for Cycles, giving us different counts (35 Drums & 34 Cycles) which makes solving sheet layouts quite difficult.
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