Some high end/professional equipment have a “word clock” input/output that allows them to be synchronised with other devices. It doesn’t look like either of your devices have that feature so the closest that you will be able to achieve is to manually cut little bits out of one or other recording to bring them back in sync. It would probably be worth recording a metronome (or similar) and testing the devices at different sample rates to find which combination gives the closest sync.
This is a sister to the poster who wants to plug multiple USB microphones into his computer. Unless they’re locked to each other, the show will have resync clicks or pops on occasion as the two signals drift from each other.
Near as I can tell, in 48 minutes and 36.4 seconds Source 1 ends up .057 seconds ahead of Source 2.
This is damn confusing.
The problem with that other thread compared to this one is that both of my media captures are audio and are different lengths. I don’t have any point of reference speed wise (ie. no video to see guitar strums/vocals to match with mouths).