The link on the individual page has them with the same buffs, but the alchemy page lists their real buffs:
Greater Null Potion 31 39 35 37 349 +25dex +25MR -15agi
Null Potion 12 16 14 17 136 +15DEX +15MR -8AGI
https://wiki.project1999.com/Skill_Alchemy