I'll add... devices worn on your arm, pant pockets will have higher readings than devices in a shirt pocket or bra. I did some tests and found the spine absorbs 30% of the movements on the body core.Agreed, and different pedometers register steps differently.
If you have a smartphone, you can try installing Noom Walk app. It's a free app to track your movements.
https://play.google.com/store/apps/details?id=com.noom.walk&hl=en