I believe 7N0 907 530 C/H/M/R are considered "safe" revisions for an upgrade, but if you truely want to be on the safe side I would probably disregard the R as this has different hardware, which might complicate the installation. The other revisions should have the same hardware as yours, but newer software. There are other - and newer - gateways available as well, but I have seen people reporting minor problems with steering angle sensor etc. after installing these. Please note that you will need to code the gateway after you have physically mounted it in your car.