WIC Gerber Soothe formula

My baby is currently on Gerber Soothe formula and I went and got some the other day and didn’t notice that I picked up the Gerber SoothePro. WIC still paid for it and if you have wic you know it only pays for what you’re allowed to get. But the formula seems different, isn’t mixing well like the last cans I have gotten and is making babies poop green and very sticky and stinky (TMI sorry). Does anybody know if there’s a difference between Gerber Soothe and SoothePro? The cans are pretty much identical but the Pro is a darker purple. I googled it and nothing says anything about a difference but idk why they’d have different names if they’re not different? If anyone has an insight I’d appreciate it !