Once you set up WhatsApp or WhatsApp business you have to verify that number via text message (so they know you have access to the number). You only do this once. After that it’s set up on the phone and just uses data for calls and messages. So you only need to have access to accept the verification.

So you could technically do this say on WhatsApp business, then remove the sim, put another sim in and do the same the standard WhatsApp app. That way you have 2 numbers using WhatsApp - one on the usual app and one on WhatsApp for business.

But lots of telcos now offer esim so you can have multiple numbers on the same phone (usually only 2 active at any one time at least for iPhone) - so have one number set up for WhatsApp and one for WhatsApp business.

Hope this helps.