XTR 8 speed cassette

I have a VGC M900 cassette which may be available depending on an answer I'm awaiting regarding n XT 737 one on here.
Price will be £55 posted
 
May need some assistance here what's the difference between M900 & 950 8 speed cassettes?

It will be used on a XTR M950 hub

Thanks in advance
 
M900 was only an 12 tooth lowest cog.

M950 was first xtr for compact drive with 11 tooth lowest cog and equivalent reductions in teeth throughout the cassette.

Not sure if the widths are different and whether they are interchangeable.
 
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