If I buy a fabric swatch will it be the same as my supplier overseas?

Yes, any dyed cotton production for SMART swatches and the other cotton products occurs in one dyehouse and the quality control is very strict, colours have to match the original standard to a delta E measurement of 0.5 which is hardly noticeable when visual matching and also has to be on the same side of the standard in chroma, hue and lightness as all previous production of that colour.