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Lol, sure there is. All the compounds above are composed of abrasives considerably harder than an Ark. Spending too much time in one place with these will result in local deviations from flatness....

A cloth buffing wheel can easily cut an Ark - as long as it's loaded with the right compound. Diamond compound will obviously cut one, as will CBN, boron carbide, silicon carbide, aluminum oxide and...

Mine are pretty much indistinguishable (as long as they are prepped the same) also. I have a couple white translucents (1 Pike, 1 Norton), a couple black translucents (1 Norton, 1 Natural Whetstone),...