They did change bits of the interior but nothing that would effect fitting The Cockpit Chrono Pack , the main reason for my comment that The Cockpit Chrono Pack may not fit the pre face-lift models is based on the software issues (you may not be able to do the programming, I could be wrong

), as quite a lot of electrical components were updated / changed on the face-lift model

.
When you remove almost anything from the MINIs you find that all the actual plugs / connectors pretty much identical eg. in the case of the central clocks (Chrono, Sat-Nav, Big Speedo) you Will find that they all plug into each others looms (this should never be attempted unless you know what your doing

, as damage could accrue

), but this does not however mean that they will work as although the plugs are the same the wiring will be different ie. more or less pins in one plug than another, pins / wires in one place on one plug for one unit may not necessarily be the same pin / wire, with the same function, source as for another unit unless it's actually a direct replacement part, the plug for the little clocks (rev-counter & speedo) and the large speedo is the same, it's just the wiring thats different (I think

).
As for removing The Cockpit Chrono Packs, as it's been said before, it wasn't the most popular option, I have one at the moment I have 1 full setup but, I'm in the same position as you I want to fit to a pre face-lift (mine), but I'm not sure if it can be done and I've not had time to try and do it (or look into it), plus as it's not a kit the wiring needs tracing & sorting out (it's part off a loom).
One of the reasons that I'm saying The Cockpit Chrono Pack can be retro-fitted is because, I was trying to buy some programming equipment and in the PDF document or the Instructions for the equipment it showed a sequence to go through for fitting The Cockpit Chrono Pack retrofit kit in the retrofit section (so my assumption that it can be retro-fitted is based on that, so I may be wrong

).
The thing that I struggle with sometimes is the fact that most things need some sort of programming, although I can do everything else myself, the programming equipment will be very expensive, so I'm relying on the main dealer or someone who can access the equipment to do it for me (programming), although that can be OK, if one wire or component is faulty, not compatible then they're not interested in trying to sort it for you and it could get very costly, whereas if I had the equipment myself I may have been able to sort the problem.