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I'd run a head cleaner on the cannon first. Then you can pass them back and forth all you want as long as you stick to the same brand. A lot of us digitize to our editing system with a cheapo camera and record with our dvx. This cuts the head usage on the dvx in half. once it is ont he tape as 0's and 1's any cheap camera can play it back with the same quality.
As for the switching tape mediums hurting you camera...others will disagree with me and say it is absolutely crucial to stay with one brand. At my college we used a different brand every week. We ran a head cleaner tape through them once every 100 hours. When I graduated they had over 2800 hours and were still running strong. Now that being said, if you can stick to one brand its certainly not a bad idea. I think if you clean the cannon once with a head cleaner tape you should be fine and wont have to worry about cross contamination. Its not like head lube is a virus and uses the tape as a carrier to spread to more and more cameras.