Completely different projects. LINKCHAIN (LNK) (soon to be in ICO), is a supply chain project for buyers and sellers of freelance services e.g. graphic design, web design, or copywriting for instance. It will work with/ on-top-of currently established platforms like LinkedIn (initially), and later on Facebook, Fiverr and Upwork too, but make it safer, easier and cheaper to conduct business, whilst still retaining access to the huger user-bases of those platforms.

Chain Link (LINK) on other hand is a blockchain project focused on connecting smart contracts to real world data, events and payments.

LINKCHAIN (LNK) will probably be a top 50-100 cmc project and is well worth the investment in their ICO when it starts on 11th November this year.