I had a 2005 for 13 years with a Radflo suspension system I installed. It was easy enough to bolt it into the 2018 I now have so compatibility is not an issue. The front coilovers are adjustable so that may make a difference.
If you were going to measure lift difference you might want to use a spot such as the front skid or somewhere on the frame. I'd also look at the angle of the front lower A-Arm for comparison. Due to body styling differences any measurements to the fender well lip might not be the same.
Lots more pictures at my blog. To my eye I don't see any difference. Note that in some of the pictures the terrain may impact the stance a bit so I grabbed a variety of shots. The trailer compresses the rear springs a bit too.
Lifted but with OEM tires
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Jim _ My Adventure Blog:
http://suntothenorth.blogspot.com
2018 TRD Off Road Premium
ARB on-board compressor - RadFlo coilovers & rear suspension - Engel freezer-fridge - All Pro LCAs - African Outback roof rack, RCI skid plates