Old BBC news bulletins: 93-99

I just wish to ask if anyone can clairfy the following:

I have notice that many of the BBC bulletins used a lighter blue setting etc,
http://www.youtube.com/watch?v=93BllVYN3XU


I have seen a few other later night bulletins which used the BBC 9 oclock news set.
IE:
* http://www.youtube.com/watch?v=zCQVdHxxt5E
* http://www.youtube.com/watch?v=ex1wqWnt7OQ
* http://www.youtube.com/watch?v=24myU-fmOwY

Where the later night bulletins just the same as the day time one?

#This one had the lighter set but the muisc for the darker set.
http://www.youtube.com/watch?v=n_5R4JmDP4s

What exactly is the question? That they are different colours?

The background plastic panels behind the newsreader were removable and changed across the day for various bulletins. Pink/blue for Breakfast News, light blue for the One and Six and dark blue for the Nine. Weekend bulletins were generic and used a shorter version of the Nine music and I believe the dark blue panels regardless of time. The last clip you linked to is from a generic daytime BBC Two bulletin hence the short Nine music but I don't know if the set is using the 'daytime' set inserts because that is what they always did for BBC Two bulletins or they just left them in from the One/Six/BBC One daytime summaries.

Q: did BBC bulletins used both types of set for the weekend news, depending one time?

Yes is the answer to your question, IIRC. The last clip you linked to is in fact not a generic BBC Two daytime bulletin, but rather the old Saturday evening BBC Two bulletin, which lived on from the days of NewsView and which was discontinued around 1999-2000.