Cirrus with FADEC?
I don't think it is correct that the SR20/22's are fitted with FADEC. Some models may be, but the vast majority are still fully mechanical fuel injection, CS prop with 'single-lever' control. Actually it's not even 'single-lever', since you still have to manually adjust mixture, where necessary.
With regard to differences training, there are two levels of requirements. The first is what the CAA will allow. The second is what the owner/insurer of the aircraft requires before they'll let you loose.
A