I spoke to my sister about this this morning (her school had to be closed due to intimidation -2 buses of SADTU members arrived and were threatening to burn cars etc if the teachers and pupils didnt leave immeadiately - lovely at a school with 5 years olds)
She teachers Grade 1 and I asked if it mattered if I child could read or had been taught in a different way. The aswer is no. In a good school they will put them onto more "advanced" readers earlier and should give extra work. Usually the other kids catch up by the end of foundation stage (unless the child is very bright, in which case it wouldnt matter if they were able to read early or not) As for whether it matters if they were taught differently, thats not an issue either. Current teaching methods allow for the children to leanr in a way that they understand (eg they dont teach traditional long division any more, but my some children find that this is the only way they can do division, so as long as the reasoning and their understanding is there it doesnot matter how they get to an answer. If you didnt allow for this there would be a problem when children transfered from different schools, provinces, countries (JUdy had 2 transfers from the UK this year)
The way writing is taught differs from school to school, and she feels as long as the letter formation is correct and work is set out appropriately then does it matter how it is done (that said she is finding the 2 UK kids very difficult because they never used lined paper before).
That said she works at a very good school with max 20 kids in a class and a teaching aide per class. They also have an onsite OT and a speech and language therapist that comes in 2 times a week.