Cheers.On most (all?) dual sim Android phones, the app gets cloned to the second sim. So number A gets one copy of Whatsapp, number B a second instance of Whatsapp. You have two icons on the screen and tap the appropriate one for the number you want to use.
There are actually 2 Telegram apps that you can use simultaneously. One is Telegram and the other is Telegram X. I currently use both and have it set up with one w/ a US # and the other a UK #.
Is that to cater for dual-SIM or are they different versions altogether? WhatsApp may not be able/want to do the same and anyway, having multiple versions of the same (popular) app isn’t a good thing.