Im currently growing some white widow, Ive got 4 plants but one looks different and has started to flower before the others. I grew them from seed, all from same seed bank in same pack. Is there any chance theres 3 white widows and the other one is different?

i dont think anyone does a job with perfection.

No you'll find it's common for some packets of seeds to throw out very different phenotypes. Some people dislike this as they say the strain is unstable, but for most percy growers just searching for something they like it's ideal.