I assume you could if everything matched up (also depending on the client used to connect), but it's probably best to update. More features, etc. You will also be able to get better help if you're working with the most recent files.
Also, it takes 10-15 minutes on my server to load the PEQ full DB script (granted it's a really old PC) via MySQL Query Browser. I have more luck running the scripts via the command line. The full file is like 150 MB. I'm not sure if navicat can do that, but I assume it does.
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