Very good questions I don't recall being posted before--probably due to most people not having access to rabbit pinks.
It seems reasonable that they would be nutritionally equivalent to mice and rats. After all, adult rabbits are as common as rats for food items. A question that comes to mind is whether or not your snake(s) will accept them as food items.
I have some snakes who will eat only rats or only mice. But, there again, I have some who will eat almost anything that doesn't eat them first. Rabbits smell/taste different from mice and rats. If you do feed rabbit pinks, I would be curious to know which species accepted them readily, which had to be gradually switched over, and which refused. Keep us posted.
regards,
althea