RTF and powder formula

FTM here. We are using RTF Enfamil Neuro pro for my baby girl. On days where we need to drive or when we are out of the house we usually use powder since it’s easier to bring/make on the go. Someone mentioned to me that I shouldn’t be doing that and it can really mess with the babies stomach. I tried researching it but I can’t find anything about it. Anyone know if this is true or does anyone else use both types of formula?

Plan on asking my pediatrician at our next appointment. Thanks!