Honest co diapers running small?

Cici • Mama and Etsy shop owner! My etsy shop is SerenadeBaby
I have size 3 honest company diapers, and plenty of size 2 pampers diapers. So does a size 3 in honest equal about a size 2 of regular (pampers swaddlers)? Should I buy size 4 in honest co instead to fill up my stock for size 3? Help! Does anyone have a visual comparison?