Err, no. Methamphetamine is significantly different from methylphenidate. Methylphenidate (Concerta, Ritalin, etc) is more closely related to amphetamine, but still not a derivative. It's like saying that thebaine is a derivative of codeine due to them being similar in structure.
If we're getting technical it's merely in the same family as methamphetamine. Meth causes a _much_ larger dopamine response which among other reasons is why people find it awesome and addictive.
