All Tavor Tar-21, Sar-21 and x95 are Israeli made, even the US production. Harrisburg just swaps out some minor parts for US made ones for 922r compliance before the rifles are distributed to retailors.
Production of the Tar-21 (more recently called the Tav-21) is ceasing in favor of streamlining commercial production lines. One for the Sar-21 and one for the x95, both of which will produce US and Canadian rifles, with the only main variance being the barrel length, and the american ones marked Harrisburg.
Our current Tar-21 line will be replaced by the US Sar-21 model with Canadian compliant barrels. The most noteable changes to the end user will be the addition of ODG color and the replacement of the "para-cord sling holes" with QD cups, both positives in my opinion. The rifle will remain Israeli produced, direct import, no US 922r parts (not a big deal anyways).
In other words.... no difference other than barrel length and a stamp that says Harrisburg.