Sma comfort to sma pro

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My son usually has sma comfort milk but I’ve not been able to get any and I’m down to my last ton so I have got some sma pro. Will the wreak havoc on his tummy or should he be okay?

Bump

How old? My little girl has been on comfort since 2 weeks old (cow and gate) and a week ago i changed to normal simply because i thought right time. Shes 6. 5 months now and no problems at all. Shes actually stopped spitting up completely and glad i made change. Think depends on age and if ready, but nhs have said to use 1st infant milks if you can't access comfort ones

He’s 15 weeks old