Off the top of my head I could not think why. Since tension should be the same for any given set of strings in the same tuning on both system cause it is needed for that pitch. Scale should also not be different on fenders. It is also not running any longer as far as I know.
In my experience the only difference between perceived string tension between trem and hardtail is when bending. I donīt exactly recall what it was like since I did not compare for quite a while, but I seem to think that bending on trem actually seemed softer to me.