I've had 3005se Eggs. The stands would double up as a cabinet mount or wall mount. Same goes for the 2001s which I had many moons ago. The 2 series was smaller I memory serves me well. That's why I said to give KEF a call, you never know your luck.
From memory the wall mounting on the 3 series will take the speaker further from the wall, they are very fiddly to get wired up to the binding posts as well. When you say stands do you mean the cabinet stands or proper 60cm stands. Great speakers though.
Kef 3001 satellites do fit the 2001 wall mounts however the Allen key bolt (think they are 4mm thread) are to small as the depth is longer on the 3 series. This can be rectified by sourcing a 10mm longer bolt dimension which locks the mount in place. The stands for 2001 satellites are a little more critical and require a couple of washers to make sure the don't ground into the speaker housing.
So it can done and relatively easy.