This is from right after Kunark opening, but I'm not aware of any changes prior to this- it's just the first time I used SoC on my druid.
SoC would OVERWRITE SoW, leaving you without any run speed enhancement when it faded. I remember this distinctly, as it caused my death shortly thereafter
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I think now it stacks on live, but that didn't happen until sometime later (maybe when they made the change to allow root and snare to stack?), when they made speed enhancements stack- not really stack, only the most powerful will be active, but it doesn't overwrite the others ones, so for example, if you have SoW and a Selo's, you will run at Selo's speed, but when Bard goes LD, you will still run at SoW speed.
I know, confusing. Bottom line, I remember SoC over-writing my SoW back in 2000, leaving me slow and dead when it faded.