formula to find where there is no match for a string

I have a formula in Column C to make sure the SearchTerm and Customer material have the same number in the string. I need column D to make sure that the Search Term and Customer material has a base. Base is when the SearchTerm and Customer material are equal.

In the excel file the first data set does not have a base associated as it starts with an alt1 and MFG Obsoloete. It does not contain Customer material 0780 21 01. The second data set does have a base (0780 27 09 ST = 0780 27 09 Customer material.

I only want column D to indicate where there is no base.