<p>From the SAT website:</p>
<p>[SAT</a> FAQ](<a href=“Help Center: Students – SAT Suite | College Board”>Help Center: Students – SAT Suite | College Board)</p>
<p>"Are some SAT tests more difficult than other ones?</p>
<p>All editions of the SAT are developed using the same test specifications. Even if there are tiny differences in difficulty from test to test, a statistical process called “equating” ensures that a score for a test taken on one date or at one place is equivalent to a score for a test taken on another date or in another place. The rumors that the SAT in one month, say in October, is easier, are false."</p>
<p>Yes, they do this for Subject tests too.</p>