These are two different brands with same chemical name i.e. Methylphenidate. It usually helps with anxiety by increasing dopamine but at times can paradoxically cause anxiety. One reason for the anxiety could be increase in the dose of methylphenidate, which you have not mentioned.
Next Steps
It's always could to consult the treating psychiatrist whenever one faces side-effects due to psychotropics. So please discuss this issue with your treating psychiatrist.