They are both biphosphanates. Actonel is oral, so if you have GERD, you might want Reclast, which is an IV infusion. There are various dose timings for Actonel, often once a week, and Reclast is often once a year. Both have varied timing but just to give you an idea.

Actonel is an oral bisphosphonate, and often taken weekly, though dose timing can vary. Reclast is an infusion done once a year or with other timing for maintenance. Oral bisphosphonates tend to worsen GERD if you have it.