In KiCad, all layers should appear as if viewed from the top, so if you have a scanned image/photo of the bottom side, it will need to be mirrored.
I’m fairly confused about what you have done so far. KiCad can read Eagle PCB files directly if they are Eagle v6 (XML format). Other third party tools can read binary and schematic parts of Eagle projects. The free version of Eagle can be used to read older Eagle projects and save them as XML, even if the board exceeds size allowed for editing.
Do you mean you redrew the schematic in KiCad? If so, it would still be a lot easier to import or convert the Eagle .BRD file than trace over an image.
@bobc Now I think he means that he used the ECO layers to copy the image of the existing product into PcbNew. Now he needs to move the parts to where they were originally located on the copper layer.
I’m not 100% certain. What type of file are the scans? You have been implying a “*.mod” file which is the KiCad file for a footprint; hence some of the confusion.
If the scan can be converted to a .dxf file, that can be imported into PcbNew, and I think it might be able to be imported onto the ECO layers. Under File / Import / DXF File.