No. I tested it many times. Not in this case.
I have a habit of playing test flights for all my work...now and then. Flight - always 8 aircraft for every skin/squadron set - to have a wide view of decals within the squadron, every possible loadout.
The answer is here
I always try to upload everything in the max possible resolution so the end user can resize down if needed.
I mostly play on 3072 or 2048 skins....But, again, I upload 4K.
i do not recommend changing BUMP maps into jpg. - The game will have a tendency to read stock files instead, and then you will have mismatched "skin paint" features.
So, bump files bmp. Can go down to 3072 too.
Screens below are still in 4096.
I have exactly the same stuff as you. Tested many times. Recently, 14 minutes ago.