Yes, they are both currently classed as <i>Geochelone carbonaria</i>.
Although many, including myself, feel that Cherry Heads warrent full species status, taxonimists to date seem to think they are the same species. What do I know anyway
I would have to ask why you would want to do that though. Wither ther rarity of Cherry Heads, I would think keeping the lines pure would be more benifical to captive populations. Again, just my opinion.