Seedbank genetics - same DNA?

I was just wondering if seeds from a seed bank are the exact same DNA as each other, or a batch of seeds is taken from several similar DNA plants?

I have two plants grown from the same strain seeds. (Shark shock CBD)

One plant is performing better than the other and that is the plant I plan to move to flower.

My question is:
Are seed bank seeds all the exact same DNA?
Is the under-performing plant grown from the same seed strain exactly the same DNA as the plant that is growing better and just had a slower start?
I was planning on using the smaller slower plant as a mother to take clones from, but I am wondering whether I would be taking a different slower growing genetic as a mother plant.

Cheers.

Fem seeds usually come from a single plant that was self pollinated or pollinated with another female. So it's the same strain but not a 100% copy of the original. The chromosomes are different
There will be slightly different phenotypes in a fem pack but similar growth. Your short plant could be a runt or could be a stocky pheno. Is she growing leaves at a normal pace while staying short? Or is the growth rate like watching paint dry?

I would clone the faster grower and make the clone into a mother. Better to take clones of both to see which is the keeper. And then to make a mother grow slower, use less light, lighter feedings (if any), and root prune

Hope this helps a little.

Thanks heaps, very helpful.

Modern Cannabis is not homogeneous as today's breeders are frauds. It is also prone to lateral gene transfer via microbes.

No one selling seeds will tell you what part of what plant they were taken from. Seed banks don't even grow mature seed anymore. They harvest on a flowering schedule, also selling the weed to extractors i guess. 100% frauds milking an infantile niche market. Every seed should be mature and from the top cola of an overly ripe purpose-bred strain. Not the case in any regard. They grow some weed and "oh here's some seeds from it, i think the father is OG, oh wait which one was in the white and which was in the green bag? I dunno, 100 bucks please"

Many seeds these days are just pollen chucks and a money grab. Crosses of crosses of crosses. No breeding at all. It's a crap shoot as to what will end up growing. There shouldn't be a half dozen or more pheno's if it was bred and stabilized properly which takes a long time. The F1's many people are selling are just chucks. Pollen chuckers like myself and half the people on this sight have been doing the same thing for years. I don't call myself a breeder but I've put more work in than many of these $20 a seed shysters out there.

Here is a strawberry banana fem. plant upfront

That's a damn good looking plant!

dna is a team of lame ass, who deserted california in 2000 whne it was needed to fight for prop 215, the cheeks at dna didnt feel secure they prefered to play the cannabis cup camp border lines with high times, if you look at these jerks, you noticed they reported 70 MIO but they cry like gypsys at the spannabis camp. after all these guys are used to camps!
diltuting palieting, hype and its 100% dna , not even broderline will named themselve as is, but its possible with these 2 vulgar hollywood cheeks

No living thing creates offspring with perfectly identical DNA - that's why some people make a big deal about getting clones of specific strains. Evolution wouldn't work without minor changes in DNA from one generation to the next. Think about siblings - identical twins aside, a pair of brothers don't have identical DNA and quite often can grow up looking completely different. One may be tall and thin and another short and stocky. Even with the same parents. So when one plant produces seeds, even if all of your seeds came from the same plant, there are going to be minor differences, and the chance of recessive genes coming out. Part of breeding out a new strain is selectively breeding to stabilize the genetics to make the recessive traits more recessive and the dominant traits more common to make the strain more homogeneous. But these days a lot of breeders are in a hurry to get their strain to market and there's still a lot of variation from seed to seed.