Is Brevo cheaper in another country?

We do not convert currencies. Every figure here is what that market’s own pricing page printed, in the money it printed it in. There is no exchange rate anywhere on this page: an invented rate would be stale the day after we typed it, and it would turn several honest readings into one guess. Where two columns carry different currencies, read them as separate facts rather than comparing them.
Where we do compare. Some vendors quote several markets in the same currency — and a good many bill the whole world in dollars, whatever country you open the page from. Those columns can be set against each other honestly, so we mark the cheapest and say by how much. That is subtraction over two figures we read, not a conversion. Which markets share a currency is a fact about the vendor, not about geography, so it is read from the record for each one.