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Well it does say DW1550 on it, doesn't it? But, unlike an Apple Card, it does not work OOB though... I've checked size of Apple's BCM94360CD on its mini-PCIe adapter (my leftover from the E6220 I sold last year) and it does fit exactly the size of a full-size mini-PCIe wireless card so I'd go for that.

Here is that old thread re: E6440 mini-PCIe slots: https://osxlatitude.com/forums/topic/10117-half-size-pci-wifibluetooth-card-for-airdrop Meantime, on the Net...

As they say in the Dortania documentation, get to know your hardware 1st and foremost... There are no M.2 slots in the Latitude E6440. Otherwise you'd have had no need for your mini PCIe-to-M.2 adapter (just for antenna adapters). Do consult the E6440 owner's manual or Dell's own support forum where this was discussed many years ago. The Latitude E6440 has 3 x mini-PCIe slots: 1 x full size (WWAN) which is combo PCIe/USB/mSATA (the one to use for a combo wifi+BT card) and 2 x half-size (WLAN + 2nd one under the WWAN slot). I know, I once had an E6440. I'm pretty sure we also have at least 1 old thread in which I actually illustrated those slots. Do use for forum Search facility... Space is a little tight for a BCM94360CD in the E6440 but I think it would fit in the WWAN slot. I'll give you the card's measurements. Re: Apple BCM94360CD, please refer to the dedicated thread we published back in 2014 in our R&D forum section. Another alternative to your defective BCM94360NG installation is to opt for a BCM4352-based mini-PCIe card such as the DW1550. It's supported in Big Sur and I understand it remains so in macOS Monterey, so...

That's incorrect, the E6440 actually has 3 x slots for add-on mini-PCIe cards, one of them is full-size (and combo PCIe/BT/mSata). That slot sits on top of a 2nd half-size one and I'd agree that the connector is not easily visible when you remove the cover (because the full size slot is at 90° of the 2nd half-size one). Nevertheless, it's there... I personally use the slot for an mSata SSD... You should consult the E6440 maintenance manual available on Dell's web site.