Hi Maverick16
Though ED-6 & ED-4 cover a similar area they do look different and are of a slightly different scale (irrespective of them both saying 1:500,000), of course things like airspace, obstacles, navaids, & variation have changed.
The IFR charts have significantly changed, in my view the old charts were much easier to read, my students would confirm this. Charts cover slightly different areas and again there are new/different airways/RNAV routes, navaids, variation but the biggest change on the high level charts now include RVSM routes. Also most of the VFR & IFR airports have changed too.
You might get away with measuring a true track & distance on the old ED-6 chart but I am afraid several questions refer to features only shown on ED-4. My advice is to bite the bullet and buy a new Jeppesen Manual assuming your authority are using the 2017 version, cost around £70.
Regards
RichardH.