As A Heart Patient I Am Have Been Prescribed Potassium

As a heart patient I am have been prescribed Potassium to offset the my diuretics medicine could delete my Potassium levels I have two prescriptions in my possession and both read potassium chloride,however, one prescription reads potassium chloride 10meq sa tab,and the other reads potassium chloride er 10meq tbcr.The first was filled by the VA,and the other by our local pharmacy Bartels drug store. I need to if they are the same or if they differ. Appreciate your response.jim Sturgul 425-572-5024. YYYY@YYYY