In my opinion, the 2001 note should not be with the others, there are a lot of differences (besides the banner height on the obverse):
The “yellow” on the left of the 2001 obverse is composed of repeating text:
The yellow on the reverse on the right is also composed of this yellow text:
On the other notes, the “pink" on the left obverse is composed of lines, not text:
On the reverse right of the other notes the pink is composed of the same repeating text as on the 2001 note, but in pink.
But there is a difference in the border to the left of this text. On the 2001, there is no wavy border:
The other notes have a wavy line border:
Then on the edges of the notes, they changed the pink pattern. On the 2001 note it is straight and diagonal lines:
On the others that pattern changed to hexagons:
Then there are UV differences. Here's the 2001 note obverse at 365nm. The UV activity involves the patterns at left and right sides and also goes over the wavy border:
On the 2002 note the UV doesn't extend to the patterns at left and right and it also stops short of the wavy pattern:
By the way at 254nm they all have a red pattern visible on the obverse. First the 2001 note:
And now the 2002 note:
