Phedimus kamtschaticus, and Sedum Kamtschaticum are the same plant. The botanical name changed from Sedum to Phedimus.
Yours looks just like my Phedimus kamtschaticus. I think Youngs has that one.
There is a Phedimus kamtschaticus var. ellacombianum, the leaves look the same. Let me go out tomorrow morning and look at my two plants to see what the difference might be.