Marathon to Isacord and Floriani Conversion Chart.This is a chart that we created ourselves by manually going through each color on the charts and comparing them to the best possible color. You may find that some of the colors repeat due to there being many more colors in the marathon range. We hope that this will help you in future with your thread choices.
If you prefer to have an actual thread chart to do the comparison you can purchase them from
Australia Link https://www.marathonaustralia.com.au//product_info.php?cPath=1_15&products_id=430