In my experience, sampling rate won't affect sync. One second is one second. No matter how many samples are in that second, PP will take one second to play it back. Sampling rate only determines the upper frequencies of the recording. (Half the sampling rate is the highest frequency you can capture.) I've never had a problem mixing 48, 44.1 and even 32 sampling rates in the same sequence. It's also my experience that poorly made audio recorders will drift even when the sampling rate matches, whereas a well made recorder won't drift. I found the Zoom H4n well made, and am currently using the Zoom F4 without any sync issues even over 2 hour recordings. Having said that, and having used some poorly made audio recorders that required attention, my habit was to line things up at the start of the clips, then adjust the speed of the audio until they also lined up at the end.
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