Welcome to the forum, glad you joined.
Do not confuse hatcheries with "breeders". They have different goals and use different methods.
Each hatchery is a separate small business with different people managing them and different people selecting which chickens get to breed. So there will be some exceptions to my generalizations, but, in general, a hatcheries goal is to mass market chicks that generally follow the breed guidelines. But the breeding method is typically the pen breeding method. They may have 20 roosters in a pen that randomly mate with 200 hens. They exercise no control over which rooster breeds with which hen. That makes a huge difference. And yes, I have had a lot of difference between individuals of the same breed from the same hatchery, let alone the same breed from different hatcheries.
"Breeders" is much less defined. Different breeders have different goals. Some are breeding to win a grand prize at a chicken show. Many of these carefully follow the qualities that a judge will see and select one rooster to put with one or two hens to give them the best chance of winning a prize. Even with this careful selection of which chickens get to breed only a few actually are good enough. One breeder on this forum said 1 in 5 of hers was show quality but most others say it's closer to 1 in 10 for them. They also feed special diets. It is not easy and their prices are certainly not mass market prices if they are even willing to sell.
Other "Breeders" do all that but also select for traits the judge does not see. That could be behavioral or production traits, even egg shell color. This is even harder. For many common breeds there may only be a small handful of people in the country with flocks like this.
Then you have breeders that have different goals. They are not interested in showing their birds but concentrate more on production or other traits with their flocks. They may favor egg production or meat qualities instead of sticking with the SOP. SOP is the Standard of Perfection which defines what a breed is supposed to be. Some don't even worry about the SOP.
Others may be breeding to develop a new color/pattern for a recognized breed (I got some Ameraucanas from one of those) or they may be breeding to develop a totally new breed.
You may even get people that get hatchery birds and sell the offspring as purebred. Many of these don't even know what is in the SOP.
The last I've heard the Cream Legbar had not yet been recognized by the American Poultry Association. There is at least one group of people (could be more than one group) trying to get them recognized. I don't know if they have settled on a proposed SOP yet or not. Some were pushing to require the eggs to be blue, others want them to be either blue or green. They may or may not have settled on other traits, even appearances. Since there are no recognized breed standards in the US you can expect them to be different.
Golden Buffs are not a breed. They may be a cross between two different breeds or even based on commercial laying hybrids. Consider it more of a marketing name than anything else. If you can tell us what hatchery you got them from we may be able to tell you more about them. They are in that group that are typically bred for egg laying qualities, not appearances. Sometimes with crosses you can get birds that all look really alike, depending on the quality of the parents. But often you can get birds that really vary in appearance.
Probably a lot more reading than you really wanted but it is totally normal to get differences in hatchery birds of the same breed from the sane hatchery.
