inpress:: stock difference

I managed to get hold of the 2 pieces of the stock we flood printed our colours onto for the front of our business cards, I was going to print our collateral onto this stock, however, it feels far too weighty to do this. So, I have compared the stock colours to the colours I am already using and am going to use what I have already done but propose they would be the correct colour as they are currently only slightly darker.