Not as far as we are aware! Many people in Berks and Bucks (ourselves included) are in the catchment for both groups of schools - so will do both exams as schools from both areas will be on our CAF.
Unless anyone knows different ...........
I wish it was one exam to be honest !!
The only thing we were told is to tick the box on the Slough forms (or vice versa) to share results with Reading / Kendrick as appropriate if you wanted to.
I will place the usual plea here - if you have no intention of putting a Bucks school on the CAF form then please do not use the exam as a 'mock'. By all means do the familiarisation paper - but the result of people from outside our area using the test in this way is to potentially drive up the pass mark through standardisation - as has happened this year. You will not get the results prior to the Slough exam - so please only do this is you want a place for your child in a Bucks school. Rant over!