replacing a .mov file with an image sequence?

What I thought would be an easy task has become very frustrating.
I have a 4k project, that I rendered 1/4 resolution proxy files.
I did my edit with the proxy .mov files.
I've got my edit done, and want to substitute my low rez .mov file with 4k DPX image sequence.
I can substitute the first frame of the sequence with the .mov file, but no option of importing the sequence.
I have tried other work arounds:
- importing the 4K sequence and trying to do the substitute in my composition window. When I try this it doesn't recognize the starting point of my cuts. It looks like it starts at the beginning of the footage instead of the cut "in" point.

- I've also tried replacing the footage in AE, but again it's not recognizing the correct place of the cuts.

Footage is all interpreted at the correct fps.