Yes Breeding Snow x Snow will give 100% snow boas...

However its not recommended. While not a lethal mutation it does have a tendency to produce birth defects (the most common ive read about are missing eyes)

Once you create your first snow boa, everything you breed it too will produce "het" for snow, so what is recommended is breeding a Snow back back to a normal looking "double het" for snow.
That cross should yield. (out of 16 offspring)

4 Snows
4 Albino (het for snow)
4 Anery (het for snow)
4 "Double hets" (normal looking)

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