They have similar apps, so yeah BUT not the same as in copy paste or transferring it. I mean for ex: your iphone has twitter, fb, whatsapp, worldclock, crashme.
You buy a blackberry and checkout the bbapp store. You may get twitter, fb,whatsapp, worldclock but there is no crashme; in which case you are screwed. So you can look up and get the same apps ( in bb format). Gd luck