The “same” carb on both? Or the same “type” carb? No 2 walbros are the same in the way they tune. There are some better than others. When you find the “one” you will know it.
You need to learn to tune on the fly. All the fast guys do it. Personally I would lean the low down for the start and then open it up as you get up to speed.
An older fart than I used to say “tuning is tough” he was correct. It’s one of the more important things that separate the guys in front from the guys in back.