According to the number that you prepare, so shall you do for each one according to their number.
Torah Temimah on כמספר אשר תעשו: neither less nor more than the prescribed measure per animal (Sifrei).
English: “According to the number that you prepare” — that one not diminish; “so shall you do for each one according to their number” — that one not increase.
Exact per-animal measure; no bulk discount or surplus.
Even though voluntary standalone nesachim are permitted, one may not pad or skim the measure attached to each animal.