Forum:Designate v. Target (BESD)

I've seen a lot of people say different things on the topic, but I've never found any official rulings.

Blue-eyes Shining Dragon uses the word 'designate' instead of target. To me, designate is somewhat (but not necessarily) synonymous to 'target', so I would assume mirror force and the likes work on BESD, but a lot of people tend to disagree. Afterall, card text seems to be specific and it is strange that they use the word 'designate' instead of 'target'.

Can anyone shed some light on this? Pointing to some official ruling I can't find would be great.

Thanks.