Not sure what it is with ASF's since they are actually born fuzzy. Generally though ASF's are about 2 to 2.5 times the size of mice at most development stages.
ASFs are 2-2.5 times the size of mice? I just had my first litter of ASFs after breeding regular rats for a long time and the pinks are TINY. I have never bred mice but I can't imagine the pinks being that much smaller than the ASF pinks.