Yes, Pitroad says the A14/A15 flywheel is thicker than A12 flywheel.
Quote:

So that means there are multiple variations:
* thick or thin flywheel
* thick or thin release bearing sleeve
* Engine plate or not
And i suspect that the 56A is slightly different than 56L (difference from bellhousing face to ball stud, as mentioned by DIYMARK)

All this means you can get multiple combos that DO work. There there are combos that don't work: Either clutch won't engage, or clutch won't disengage.