Need advise

Hi mummies! Just curious , how many of ya'll upgraded your child's milk to stage 3 once they've turned 1? I've been contemplating to change it as my husband was insistent that the nutritional values are the same. We're still feeding him stage 1 Dulac and my son is turning 17 month soon 😅 he's been eating really well and only takes formula during the morning and night . Will it be okay if i stay on with stage 1? Or can i change to full cream milk powder like those nespray , cowhead or fernleaf? Oh, to add on, he only drinks freshmilk if it's chilled or warmed up and only drinks farmhouse brand. Reallt confuse right now if i should change or not. Your advises are highly appreciated!!