Excel Formula to do an exact match of 2 column of 2 excel file and return value if found

I have the below excel files


mass update.xlsx (5 excel)
db2.xlsx (1 Excel)

Download:
https://we.tl/t-ct7dFfCQ26

I need someone to provide me an excel formula to perform the below


first: perform a search for an exact match of mass update.xlsx B and D with db2.xlsx column A and B

if exact match found

copy db2.xlsx column D to mass update.xlsx column K


You are required to provide me the excel formula to perform the above and guide me on how to use it