We do not provide a colour management or colour-matching service. We provide a digital printing service, and variances in colours can occur as a result.
However, please save your artwork in CMYK for greater control over the colour production (Example Profile to use PDF/x-1a Coated FOGRA39).
If your file's colour setting is saved as RGB, the colour production is likely to be affected, because the file will be converted to CMYK.