I checked on my TB03 and the Evo 4. The diff width is fine, the tb03 gear will NOT mesh with the bevel gear. I also tried using the bevel from the tb03 and there are still some clearance issues, so not likely to work. The other consideration is that the plastic dust covers on the diffs foul the gear diff do if you could get it to work, you would need to run without the covers.
Not sure what your motivation is to run the gear diff, but mine is because the spool is hard on the drive train, especially if you bump a board under throttle, it crunches the diff gears. The one way is useless on my track and a ball diff done up too tight is not a great alternative. I might try some harder diff balls, but I suspect they will mean diff rings will get scored quickly. A shame there is no gear diff that will fit the Evo 4, but I reckon the Evo 5 shares parts better with a tb03, dunno if the IDR is the same though.
A few years back I created a 'tough' diff by using friction pads instead of balls, it was almost a spool, but had some 'give' in te event of crash or locking, might try that as an experiment.