I'd definately go for it anyway. You never know till you give it a go. I've done jobs before where I was doing something, then got another job doing the exact same thing and it ended up being over 50% more pay. You can just tell them that you have experience in this and that, and youre a fast learner and would surely be able to (and are very keen to) learn your new role very quickly since you have most of the knowledge required.