Excel formula if statement with link

Hi all,
so if cell a1:a50 contain 5 digit product codes, and b1:b50 contain prices on a serperate sheet there will be a list off 100 product coes from a1:a100 named product, and in b1:b100 on the same sheet will be a price assosicated with that product code, called price.

I want a formula that will check if a1 = a value found in the list "product" and if it is found i want it to check if b1 matches the prices in the cell next to where it found the price in the list "product"
Make sense?

so if lists look like this
product and price
11111 250
11112 255
11113 265
11114 400
11115 350
11116 375

if a1 has 11113 and b1 has 255 c1 will say error

if a1 has 11113 and b1 has 265 c1 will say correct

Thanks everyone