Difference between HFBR-53A5VEMZ from and HFBR-53A5VEMZ-C

We often get asked what the C signifies and whether or not the HFBR-53A5VEMZ-C from ATGBICS can be used to replace the HFBR-53A5VEMZ from Foxconn OE Technologies Singapore Pte. LTD. According to ATGBICS here, the C denotes that the product is a 100% guaranteed compatible version of the original product.