I think you need to define "synchronise", as there's a couple of questions about this.
Do you mean "copy values"?
You also ask about "between different types of linked issues". Field data lives on issues themselves, not type or link, so I'm a little confused about the actual goal here.
I don't think there's any free add-ons to do any of the cases I'm thinking it might be though. If you could help me understand what I've missed, there might be something, but my instincts are that you're going to need one of the flexible add-ons, probably not a free one.
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