AFAIK no clones of the jackson were made. It's probably a clone of a president grant, like every other 10 meter export.
I never had a jackson but I do have an export grant. The export jacksons had fm and 5 or 6 bands , im not sure and the export grant had 3 and fm. There are a lot of posts on the net that say the jackson needs to have the rf gain turned back on ssb but apart from that there's nothing wrong with them, just a different design. The jackson had the same final as the lincoln whereas the grant were dual final.
and what set apart the jackson and grant?