1-) OG is NOT a strain. OG, does NOT stand for Original, nor have anything to do with Gangsters.
O is for Ocean
G is for Grown.
It generally refers to flowers cultivated on the coast, or no further than the first ridge inland.
It's peculiarity comes from the Ocean air, oh so different than that inland.
2-) to the original question, I cannot tell anyone what other growers are up to, think Marvel multiverse... Times a thousand.
I can however tell you that, in one same garden, planting 100% all same seeds (Burmese origin) coming from the same parent mother plant pollinated exclusively in a protective tent by one same male parent resulted in 45 unique plants with differing characteristics in terms of appearance, smell, taste and effect... even amount of resin produced.
Parts of the garden receive more light, wind, ambient moisture, etc... this all affects outcome.
The only way to hope for some stability in strains is to go straight scientific lab environment, and have one master grower overseeing every last detail.
Even then, there'll be some nuances between the flowers.
It is what it is,
You are what you It.
There are no mistakes.
Lastly, and possibly most importantly, DRY and CURE.
If you think growing methods vary and affect final flowers, there's the whole "back end" of flower production.
Drying the plants.
Curing the flowers.
Talk about Multiverse?
Also, HUGE effects towards final potency, taste, appearance, etc.