Passover kosher stricter isliye hota hai kyunki is festival me chametz bilkul prohibited hai. Even small contamination bhi allowed nahi hoti. Production facilities ko extra cleaning aur monitoring karni padti hai. Isliye certification process normal kosher se zyada detailed hota hai aur limited time ke liye valid hota hai. https://blog.koshercertifications.in/a-guide-to-know-the-kosher-for-passover-in-brief-kosher-certification/