The XA1 and the XA are different cameras. The XA1 is fixed focus, has the 35/4 lens (over the XA's 35/2.8), automatic exposure (no manual input), and only film speed settings of 100 and 400. Unless things have changed a lot since I was looking at them, an XA1's not worth a hundred bucks unless you accidentally buy it over a real XA.
Still a fun camera and a pretty good price here, though.