Yes unfortunately in my experience the dimensions of the fuselages are changing, and perhaps the quality control isn't as good as it was, as the anodising seems to be much thinner.
I recently upgraded to an iqfoil 95cm mast from the standard 95cm carbon.
While I could bolt the new mast into my 2x 95+ fuselages , they didn't really fit that well.
I felt there was a gap between the base of the slot, and the bottom of the foil mast.
I managed to get a new 95+ off a local Iqfoil racer. This one had Iqfoil stamped into the slot where the mast fits as well as the official 3d barcode, as the others had.
I found it be completely different, the mast fits in deeper and is more secure. Also, on the water I found that I had to move from a -1 shim to -1.5 shim with the same equipment and rig settings to get the same foot pressure.
Placing the new against the old there's a massive difference in front wing angle.
If I place my 4 x 95+ fuselages together each of them has a difference in front wing angle.
In conversation with the iqfoil racers, they measure the difference between the front and rear wing angles for each fuselage, as they can differ as well, as the plastic shims.