Macro to match and populate field

I am looking to read a column on a worksheet check to see if any of those strings match the values in another column. If they do I want to copy a price over. I am using this to compare 2 BOM's with part costs and I would like to have the prices copy over so I do not have to look each one up if it was already priced in an existing BOM.

Columns are as follows

QTY-PART NUMBER-DESCRIPTION-COST

I have 2 worksheets. OLD BOARD and NEW BOARD

I want to look at the part numbers in NEW see if they exist in OLD and if they do copy the cost value from OLD to NEW.

I think I am explaining it right.