Noticed RQ180/WZ-X is very similar to B21. B21 is more or less a RQ180 with a weapon bay.
We don't definitively know what RQ-180 looks like.
However, "very similar to B-21" is a vague and non specific statement.
Just because the aircraft are "large, stealthy, flying wings" does not mean one is "more or less" one with a weapons bay.
Let us all recall how in WWII, most tactical combat aircraft (pursuit fighter, dive bomber, torpedo bomber, attackers) were monoplane airframes with a front piston propeller engine, however that didn't make them all "more or less" versions of the same aircraft.
They were all very much unique, and discussions about contemporary aircraft should be looking at the unique differences that exist as well.