yeah. they are in different keys but the fingering is very similar. I too started on clarinet and switched to both sax and double reeds and it took about a week to get good facility on sax.
i know this is not on the topic, but it's similar.
i finally got to start playing the clarinet. it's not so hard to get a sound out b/c it requires less air, but you have to get your mouth on it right.