i havent seen any a525 in the US. That doesnt mean that they dont exist in different markets. If is is an EX21 control the US market had a A320 and A530 EX21 control. Normally the controls are the same on both machines provided there isnt any customer added options. If the controls are the same on both machines the only real difference will be the travel of the machine. One machine has a 325 mm in X and the the a525 has 525 mm in x. I hope this helps you some.