You probably don't need to separate the carbs from one another but I do recommend pulling the "bank" (carb assembly). As I mentioned earlier, the jets are probably really tight and would be very difficult to remove with stubby screwdrivers (if not impossible).
However, if you want to replace the butterfly shaft rubber seals, the carbs will need to be separated. To test if they're still good, you can spray some WD40 around where the shafts enter the carb bodies while the bike is idling. If the idle speed changes (dips) then the seals are leaking. When new, the seals are very soft and flexible, and they work by the vacuum in the carb sucking them in tight. When they get old, they harden up and no longer function as they should. This is an all rubber seal, with no metal band or spring in it like a normal seal. You can access the one seal on the outside of the left carb by removing the throttle cable bracket. They are a rather loose fit in the carb so you can pull the seal out and give it what I call the "pinch test". It should squeeze down into an oval shape pretty easily if it's still soft and good. Here's a new one .....
View attachment 348563
..... and here's an old bad hardened up one. It doesn't want to squeeze down, even with a lot of pressure ......
View attachment 348564
View attachment 348565
So, you be the judge on if the seals need replacing by how hard that one you can access is. Most of us buy Suzuki seals because they are much cheaper (exact same part). You'll need 4.
View attachment 348566
View attachment 348567