I have been a manager in both businesses. of course there are differences; but there are also many similarities. the big idea is that if there is a firm, inflexible deadline, you will meet it. You may not ship the product that you really wish to ship, but you will ship. and, to be honest, feature X that has to be in the product, probably can just as easily go in the next release. Don't let the best be the enemy of the good. Be realistic about your capabilities.