Answers
Do I need a separate feed for each country?
If prices, currency, availability or language differ — yes.
The short answer
If prices, currency, availability or language differ — yes.
A feed that advertises the wrong currency or a price the local page does not show is a misrepresentation finding waiting to happen.
Supplemental feeds can handle per-country overrides without duplicating the whole catalogue, which is usually the cleaner setup.
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