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Thanks for the response David.Can you suggest what should one do if trying to make each site an authority in their respective country and not depend on the original version of the site.

How much content replication is duplicate content- any percentage, ratio defined by google?

We have multilingual eCommerce websites with some content variations but majority of the content remains the same

We have used rel=alternate hreflang on corresponding ccTLDs respective countries. for example on example.com -which is the oldest of these sites- we have used

Now should we also use link rel="canonical" href="example.com" on all ccTLDs?

What are the advantages and disadvantages of using it?

We have multilingual websites with some content variations but 60% of the content on site remains the same.

Is it still advisable to use:rel=alternate hreflang option on ccTLDs  when ccTLDs are in itself strong signal for Google to display result in respective countries

1. example.com

2. example.co.uk

3. example.co.jp

4. example.de