Switching milk replacer and raw milk on a calf

Hi everyone, we picked up a second calf for our dairy cow but we're keeping her separated for a few days. I gave her milk from our cow last night and this morning, but my husband mentioned using up the rest of our bag of MR on her instead. I didn't actually ask the dairy that we got her from yesterday if they were using MR or cow's milk, but I'm worried about keeping up with this switching milks on the calf. Does anyone have info on this? Thanks