I don't think any of their lumber is exact or consistent. Couple weeks ago I bought 1/4 inch plywood that was actually 1/4 inch, bought what I thought was the same plywood a few weeks later and it wasn't 1/4 inch thick. Not sure if that is HD's fault or the mill's from where they get it from. Don't they say all there lumber is C grade and below? High quality lumber I'm presuming you have to get somewhere else.
But probably depends on what you are working on for it to really matter.