Your 1st sentence already has the answer to your question.

Keyword emphasize: PINK

Scan an e-wallet's DuitNow QR using another e-wallet app you mean?
Can, I've tried TnG e-wallet and ShopeePay with Boost DNQR before. No problem.

Sure?
Your area didn't have Maybank QRPay and Boost merchants? Recently they replaced their merchant QR to Duitnow QR format already.

As long the QR shown is a DUITNOW QR, then you can ignore the banner that comes along with it.

1) DNQR + Grab banner = any eWallet support DNQR, yes.
2) DNQR + TnG banner = any eWallet support DNQR, yes.
3) QR + Grab banner = only Grab eWallet.
4) QR + TnG banner = only TnG eWallet.

But one thing I found out i that, if the merchant displays DNQR but it’s their bank account(savings account), you will need to scan using your bank app. eWallets won’t be able to recognize that QR. Dumb me keep scanning the bank account’s DNQR on a eWallet but it kept on saying not recognized.

You mean like this one? If this, nope. Someone else need to scan this in TnG only can. If you try other eWallets eventhought they support DNQR, it won’t work.

Ah, still. As long it’s PINK (or at least mentioned it’s a DNQR) in colour, there’s no need to worry what and which eWallet’s cardboard is that. Just use any DN eWallet to scan it. The cardboard is just a cardboard. Just for advertising purposes

The original Boost (red label) and TnG (blue label) QR code is still valid. Just use the appropriate ewallet to scan it. Boost scan Boost, TnG scan TnG.

The latest DuitNow QR (pink label) still has weakness. If the DNQR is provided by BANKS , most likely eWallet fail to detect it. If I'm not mistaken, only DNQR by MAE (register as merchant) can accept payment by ewallets successfully.

GrabPay scan MAE DNQR,  successful, NO POINTS EARNED.
Boost scan MAE DNQR, successful, can get Boost Coins.
TnG scan MAE DNQR, successful, as usual (no cashback)

very likely so.
Everyone is protecting own rice bowl