Yet whether it is true or not, I still reject the premise. The Romney supporters are basically trying to excuse what Romney did as governor by what Reagan did while the anti-abortion movement was stil in its infancy and there was many misconceptions about the entire process.
No politician in the 1990s or 2000s should be ignorant about what abortion is and what the key issues are. It's been thoroughly discussed. Comparing that to Reagan's time when it was still considered an impolite thing to discuss in public is just not relevant to Romney's flip flop.
Reagan was never pro-choice, but you are right, it shows real ignorance of history for them to try and confuse the 60s with the landscape of the post Roe vs Wade America.