Surely it should be substantially irrelevant - the basic principles of flying aren't dependent upon the nature of the instrumentation.
That said, two thoughts:-
- Guessing, correctly, that a majority of my instruction would be on vintage taildraggers, I asked to do my CRI course on a Citabria that the school in question had. They refused, but subsequently it's not been a problem as the main issues where the teaching skills delivered on my course, and my existing tailwheel skillset.
- I have delivered a PPL course on an EFIS equipped aeroplane (specifically NPPL(M)-->NPPL(SSEA) in the students own Jabiru J400). Apart from a bit of mucking about getting the system working properly in the first place, I didn't find it either added or subtracted anything from the whole business. It was just slightly different. (Apart from the wind arrow in the corner of the screen, which was a godsend to a student doing PFLs.).
G