Many changes between the model years.
1st, the GEN4 is predominantly the 2010-2012 model years.
From what I understand, there were "enough" changes in the 2013 model year, extending to it's current model year offering, to justify it being labeled "GEN5". Now if the SHO elders (term used loosely) still monitor this forum, then correct me if I am wrong.
Now, with that said, and NO, this list not all inclusive, but its the best my memory serves on immediate recall, the below listed features, are the changes between GEN4 and GEN5......
Front bumper, hood, upper lower grilles and head assemblies were all/each changed.
Rear trunklid, rear tail lights, and rear spoiler, all changed.
Faux side vents, and small triangular pieces on the 'C' pillar, all changed.
Brakes incorporated massive changes (both rotors, calipers, pads, etc.). Brake booster and Master cylinder changed.
Suspension changed.
Wheel offerings changed.
Exhaust now dual tipped on all trim levels.
ECM changed (FMC was trying to make tuning more difficult/challenging).
I think the 2013's and up introduced Torque Vectoring.
PP equipped packages now included all the auxiliary coolers as found on the P.I. variants.
PTU now has drain plain plug on the housing. Now also water cooled (on PP equipped models).
Ummm......what else?
Better insulation for sound dampening throughout. Most visible on front strut towers.
Redesigned valve covers and oil separator on rear.
Entirely different instrument panel / gauges.
Seating upgrades to include SHO embroidery on vertical part about 3/4 way up from horizontal seat portion.
Goodness. Starting to draw blanks.
Oh yea, gear selector/shift **** changed.
Anyone else care to help the OP by adding to this list of mine?
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