You shouldn’t use either. These IP addresses can and will change and differ by location. You can see this behaviour using DNS Checker.
The www subdomain is also not correctly configured
$ dig www.plantproef.nl
www.plantproef.nl. 152 IN CNAME plantproef.netlify.app.
When using Netliy DNS as plantproef.nl is the only records for the apex and www subdomain you should see are NETLIFY type. While having a CNAME record might work it isn’t correct.
I suggest it isn’t possible. Using external DNS configuration instead will likely work better for your use case.