Of course in those days there were lots of internal departments, Granada and Carlton still had corporate sites alongside ITV.co.uk, very difficult to work out what was what.
I think that Granada Kids yellow endcap only appeared on series 1 of MPAA, after that it changed to the GR/N/DA logo one.
So presumably Granada Kids despite being based in Leeds wasn't part of Yorkshire, so didn't get that purple endcap, but part of a centralised Granada corporate division, so got the corporate logo.
That particular Granada Media logo was - I think - the corporate logo of the short lived Granada Media Plc during the time it and Granada Compass Plc existed during 2001-2.
In 2002, Granada Compass Plc became Compass Plc and Granada Media Plc became Granada Plc, and the GR/N/DA logo was introduced, I think, at that point.