Standard PMS colors (e.g., 185 C for coated paper) are for graphic design on paper/plastic . TCX colors are for physical fabrics . They look different because substrates (cotton vs. glossy paper) absorb and reflect light differently.
If you can tell me the (e.g., 18-1662 TCX), I can help you find its most common RGB or Hex equivalent. Pantone Color System X-Ref Tool tcx pantone converter
3. Open-Source Web Converters (e.g., CodeBeautify, RGBTo,EasyRGB) Standard PMS colors (e