You can ignore the suffix codes, Suffixes are optional letters at the end of a part number that specify certain device features. Not all suffixes are available with all part numbers.
please refer the link below for suffixes,
Hi, You said the FB ending can be ignored, but then mention it can change / specify a certain device feature. So this could be a very important change on the device. Can you tell me what FB denotes, as the link you sent doesnt mention FB.