Ask a shop that sells them both. They should be able to tell you.
Try asking the people over at
OC UK send them an email about it, but put in a way that you are interested in buying it from them, and they should give you a pretty good answer. They do when i enquire about stuff that im thinking of buying from them. Expect upto a couple of days for a reply though.
Phrase it like "I was thinking of buying a Zalman ZM-80AHP from you, but i am wondering if it would fit without problems on a 9700pro AIW. Can you conferm if it will work?"
You can still use ramsink with a Zalman Heatpipe bty.