According to Republicans, they're not doing this for pro-life reasons at all. Indeed, many of them suggested moving the funds to other women's health organisations. That might be related to the fact that the move doesn't seem to have much to do with pro-life beliefs.
In fact, the sources that most prominently claim that this move has anything to do with the pro-choice vs pro-life debate appear to be very Democratic in their nature, with the Fair and Balanced™ CNN spearheading the efforts. How very peculiar that they'd be so quick to decide what's going on in the Republicans' minds.