I think, neither 'Leopard' nor the plant commonly known as
E. schlueteri.
Btw., there is a problem with the name E. schlueteri. Jozef Somogyi, a Slovakian botanist, found out that the plant described as
E. schlueteri by Karel Rataj is different from the
E. "schlueteri" in the trade. J. Somogyi described the latter as
E. maculatus in 2006. Therefore 'Leopard' is a cultivar of
E. maculatus. The paper from J. Somogyi:
http://www.springerlink.com/content/c19q7757g88330v7/
I guess, Your plant is any variant of the very variable species
E. cordifolius.