Rick, the IMUSA pot marked "Made in Columbia" and being sold by amazon, does not fit/seal on the SJ grill as well as the IMUSA pot marked "Made in China"(Found at Wal mart). Other than that, I din't really know of any differences. I think the Columbian pot is a bit smaller in diameter.
(although I don't know the actual measurements)
I hope this helps and good luck,
Tim