Samsung Odyssey G9 49" DQHD 240Hz 1ms GTG Curved VA LED G-Sync Gaming Monitor (LC49G95TSSNXZA) - White

You won't be able to get the full resolution + refresh rate on the G9 on any currently available Mac laptop. You could do USB-C to HDMI & DP for each side but it will need to be in Picture by Picture (PBP) mode which has its own limitations.

Displayport to USB-C should get you 5120x1440@120hz on the single cable (make sure whatever adapter you get lists DisplayPort 1.4), which should be better than whatever you're getting on HDMI (like 50-60hz and/or running at a lower resolution). Something like the CRG90 (the previous generation) would likely work better but I'm guessing you already have the monitor. :)

Readers are saying that the 2020 model MacBook Pro 13-in high-line (four Thunderbolt Ports) CAN hook up to those Ultra-wide displays with one DisplayPort cable.

Older MacBook Pro 13-in seem to require requires two cables and Picture-by-Picture.

In my opinion, you should use two DisplayPort cables to accomplish this, not HDMI of any description.

when you use Picture-by-Picture you can use "Extended Desktop" to combine the screens back together and get the effect of one single large display. The fairly seamless.

... except in your case, the displays will be exactly the same size and exactly adjacent.

The laptops can connect and display with a single DisplayPort cable but not at 240hz - the only devices currently available that can display at that resolution + refresh rate (due to the amount of bandwidth required) is the Nvidia RTX lineup as they support Display Stream Compression (DSC). They will be able to display at 5120x1440@120hz at most using a single cable.

Though note - I forgot that the G9 has two DisplayPort inputs, so in that case you can do two USB-C to DP1.4 adapters and that should be able to drive both sides of the display at 240hz, though the MacBook will likely turn into a mini-furnace/lag significantly given the additional load that draws (and how weak the integrated GPU is on the 655).

The reason I said what I did is:

I read several discussions here where dozens of Readers were unable to get their 13-in MacBook Pro (older than 2020 models) to get a single-cable solution to work AT ALL at the advertised 5120-wide resolution, for various wide displays. No solutions seemed forthcoming, except to use two cables and Picture-by-Picture.

Some knowledgeable Users worked hard using SwitchResX and other tricks, but to no avail. Someone finally stated the one-cable solution for those pre-2020 models was simply not possible, and it was never refuted.

Ahhhh ok I misunderstood/misread the 13in pre-2020 part, thanks for clarifying! :) Interesting then, it must be explicitly blocked by Apple in that case as the hardware should support it. Then yep PBP will be the best option, just acting as 2 monitors.