Very much so. I-M4A yi-MP4 equlethe i-AAC okanye i-ALAC enesandi — emiselweyo ye-iTunes neefayili ze-Apple Music. That determines both the headroom available and whether the saving costs you anything in fidelity.
Yes — i-.m4a ingagcina i-AAC okanye i-ALAC, ngoko iifayili ezilahlekileyo nezingalahlekileyo zisebenzisana noluhlu olunye kwaye kufuneka zicaciswe ngokuhlukileyo ngokujongwa. It is worth knowing before you overwrite an original you might need again.
Yintoni impazamo eqhelekileyo xa uxinzelela M4A audio files?