I doubt the vaccines are designed to differ between batches; it doesn't go with the plan. I'd look at region of manufacture for QA inconsistencies. There may be saboteurs in some of the factories.

Spikes linger for a year post-vax. Shots are being scheduled at shorter-than-once-a-year frequency. This means spikes build up in your system over time. Booster after booster, you'll eventually reach a lethal level of spike.

There's no need for the NWO to specifically poison particular batches.