OK -- you have a compatibility match with the Crucials. Same constraint or choice I faced with a Gateway Notebook.
Usually, from my stale OEM experience including the laptop, you can hunt down the replacement motherboard or spec at the OEM website. It should specify the Intel or other chipset. Whether you find anything in the board specs that says "OC" for a ram setting and shows 2400, your job is done.
If it doesn't, whatever RAM spec you find at the Dell website should PROBABLY be your best choice, but if Crucial offered more than one, you might try it. I only say that I've bought RAM before for a laptop to discover I could have better and bigger. The spare parts remaining only fit 8-year-old laptops. There's always some slight risk of unforeseen compatibility, but if you want to see in preference to 2400, you have an RMA period with most resellers, and an RMA option may be "Exchange."
Of course, we all know or can see that 2133 is the default DDR4 base setting across the board.