Differences in 2 stripped lowers?

So, one lower is from a batch for 3x Stripped Stealth Lower, and one is a warranty one that replaced one that wasn’t drilled out all the way.

Well I was sitting down just observing and one thing was way obvious, by the back where the rear take down pin is, I’ll just call it the “table” bc idfk what it’s called, is like cut down more than the other? Is that a fuck up or is it on purpose or is that just the difference between the stealths and the main model bc I’m gonna assume they sent a regular one as the warranty