I am not a shoe expert, but I think the clay court versions have different treads that allow the clay to slide and grip differently than a hard court sneaker. I don't think, however, that there is a difference in the actual rubber itself, just a pattern difference. If that is the case, the durability should be somewhat similar on a hard court and won't mark the courts. Barricades are usually extremely durable and most sneakers aren't marketed as being surface exclusive (except for grass court sneakers). I have heard on another thread that the clay versions were a little stiffer feeling, but I can not attest to it.
Head Men's Tennis Coach @ Yeshiva University. Pro Kennex Ki-5(R) & Gamma RZR 98 (L)
Dunlop Black Widow 17 (63lb) Babolat N.Vy 16 (64lb) USTA 4.5.