Logic Pro 9 Garageband overdub out of sync


I sent a rough stereo mix to UK which was then imported into GB ans acoustic guitar overdub recored ... the GB project was sent back to me with new track and sounds great if I open in GB but when I import just the Acoustic guitar as an AIF into Logic 9 it plays out of sync .???? HELP ...!!!!!
GB Sample and bit depth is 44.1/16 the Logic Sample and bit depth is 44.1/24
I tried converting the bit depth in Logic but no difference ... still out !!!


Peace n Rock n Roll B