By default the skin is in 4096x4096 res.
To replace by 2048x2048 res, just rename the "M3E30_GT_skin_01" file by "M3E30_GT_skin_00" and conversely.
To replace by 2048x2048 res, just rename the "M3E30_GT_skin_01" file by "M3E30_GT_skin_00" and conversely.