Yes, however make sure you check out the rates for each country here - https://www.vodafone.co.nz/prepay-roaming/ to ensure the countries are included in the Roaming Add-on as they are not available in every country.
Thanks @HamishA for the reply, so as long as the country is mentioned in https://www.vodafone.co.nz/prepay-roaming/, we can use the data roaming across multiple countries? e.g. if we are in the Netherlands in the morning, Belgium in the afternoon and France in the evening and we purchased the $5 daily roaming or $19 weekly roaming package - they will be useable across all 3 countries?
Contacted Vodafone ninja who confirmed that I don't need to purchase multiple roaming packs in different countries as long as these countries are covered by the roaming zone i.e. a daily or weekly pack can be used across multiple countries