So, I accidentally ****ed up when trying to change one of the strings, and now I had to buy another set just to get the G string.
Now it's time to change strings again, and I have to use the set without the G string (which is 009), and the only fresh G string I have is from another set, which is 010.
Will the difference be much noticeable to have the G string thicker?

The bridge is locked btw, so no tremolo adjustment needed.
No problem, you will feel some difference in playability though. But it is no technical issue. Be sure it is thinner than your D string and thicker than your B string.
-Jackson Soloist Std. Professional '93
DiMarzio Evolution (bridge) SD Lil' Screamin Demon (neck)

-B.C. Rich Warlock Special Edition Metal Web

-Peavey Bandit 112
There's minimal difference, I usually use a much thicker low E string on some of my guitars since I like to drop tune, so the tension matches. As long it's close enough it's fine.
Peavey 6505+ Head (Left)
Line 6 Spider IV HD150 Head (Right)
Marshall 1960A 4x12
Ibanez RG T42DX
Agile Hornet Pro 727