yea, ive seen that before with hybrid seeds. I've had perfect blends of 2 crosses, then others that leaned more to one side or the other, all from the same strain. But not the same plant! (male or Female) The ones from the same plant were 100% consistent.
so I guess if you had the same male, crossed with 2 different plants of the same strain. they wouldn't be exactly the same or vise versa. But all the seeds from each plant should be near identical

I would imagine breeders, grow so much how seriously do they know every seed will be exactly the same. I think that's impossible, they may be close but unlikely to make it 100% the same. Probably why there are clone only strains too!

Maybe, there is a way now a days, with all the hi tech stuff out there.
HA, buy some seeds, w8 a while then buy the same seeds again and compare.