What is the difference between Gerber Good Start Gentle and Gerber Good Start Gentle Plus powders?

I went to the gerber.com website and found no mention of the GS Gentle...only the GS Gentle Plus. Then when we search for it in the store (Walmart, Target and the local supermarket) the only thing on the shelf is the GS Gentle - even though the shelf states they stock the GS Gentle Plus. I'm wondering if the packaging has just changed or if our local stores just no longer carry it? Does Gerber still make just the Gentle?